CN102143343A - Video recording method and video recording device - Google Patents

Video recording method and video recording device Download PDF

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Publication number
CN102143343A
CN102143343A CN201010102835XA CN201010102835A CN102143343A CN 102143343 A CN102143343 A CN 102143343A CN 201010102835X A CN201010102835X A CN 201010102835XA CN 201010102835 A CN201010102835 A CN 201010102835A CN 102143343 A CN102143343 A CN 102143343A
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Prior art keywords
data
recording device
video
reference picture
picture
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CN201010102835XA
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陈云鹤
李玉江
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Ali Electronics Shanghai Co Ltd
Ali Corp
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Ali Corp
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Abstract

The invention provides a video recording method and a video recording device. The video recording method is used for the video recording device. The video recording device receives the first video data and records at least one non-reference frame position in the first video data. Then the video recording device determines whether the data congestion occurs in the video recording device. If the the data congestion occurs in the video recording device, a data buffer discards at least one non-reference frame at the corresponding position to generate the second video data. Finally, the data buffer writes the second video data in a storage device.

Description

Video recording method and recording device
Technical field
The invention relates to a kind of video recording method and recording device, and particularly relevant for a kind of bit rate (Bit Rate) and the video recording method and the recording device that are applicable to individual video recorder (Personal Video Recorder abbreviates PVR as) that can reduce when making video recording.
Background technology
Along with the increase of the operational capability of image processing chip, present video image is all marched toward in big picture and high trend of resolving.When the user turns on the TV of family, just can appreciate the high image quality video that is transmitted from digital television broadcasting station, a distant place.Yet, for the user, may see the program liked or advertisement sometimes and want a certain section video preserved, and watch that therefore, the user can use PVR to record to want to preserve the video that gets off at other times.
Described PVR is the TV that combines the video recorder function, is considered as very potential epoch-making electric equipment products by the part people.The built-in Storage Media of PVR can be recorded down a plurality of programs with the period simultaneously, allows the audience can freely arrange the time of watching, and even have transfer function, the video of recording can be shared with kith and kin.In addition, PVR more can external video camera makes video recording or does and monitors and make video recording.
Please refer to Fig. 1, Fig. 1 is the system block diagrams of the recording device among the PVR.The recording device 100 of described PVR comprises frequency modulator (Tuner) 110, receiving interface 120,125, Video Decoder 130, audio decoder 135, data buffer 140 and storage device 150, wherein frequency modulator 110 is connected in receiving interface 120 and 125, receiving interface 120 is connected in Video Decoder 130 and audio decoder 135, receiving interface 125 is connected in data buffer 140, and data buffer 140 is connected in storage device 150.Frequency modulator 110 is in order to the video data of the program selecting to receive, and receiving interface 120 can separate image data in the video data and speech data, and with image data and speech data is sent to Video Decoder 130 and audio decoder 135 is decoded.Receiving interface 125 can be delivered to image data in the video data and speech data respectively in the data buffer 140 temporary, and then data buffer 140 is delivered to storage in the storage device 150 with the image data and the speech data of being kept in, and makes video recording to finish.
Then, please refer to Fig. 2, Fig. 2 is the system block diagrams of the playing device among the PVR.Playing device 200 comprises storage device 210, data buffer 220, receiving interface 230, Video Decoder 240 and audio decoder 245.It is temporary that storage device 210 is delivered to data buffer 220 with stored video data, then, image data in the video data that receiving interface receive data buffer 220 is kept in separates with speech data, and image data and speech data is delivered to Video Decoder 240 carry out video decode and audio decoder respectively with audio decoder 245.
Described Video Decoder 130,240 and audio decoder 135,245 present various video specification and the audio frequency specifications of adopting, video specification for example is MPEG 2 or H.264 waits, the audio frequency specification for example is MP3 or WAV etc., and in addition described storage device 150 and 210 can be CD drive, hard disk, storage card or the flash memory etc. with instant burning function.
Above-mentioned PVR is when making video recording, if the writing speed of storage device is quick inadequately, when perhaps bit rate of video data is too high, then data buffer may be filled, and cause the partial video data to have little time by temporary, just be dropped, the video data that wherein is dropped is arbitrarily, and these data that are dropped may be the data in reference picture in the data streaming or the non-reference picture.Therefore, when playing described recorded video data, meeting is imperfect because of video data, produces and make the picture that plays back have mosaic.Wherein aforesaid reference picture can be the data of node picture (I picture) or predictive picture (P picture) in Moving Picture Experts Group-1, but not reference picture can be bi-directional predicted picture (B picture) in Moving Picture Experts Group-1.But in other video standard, bi-directional predicted picture also may be by other picture references, and form aforesaid reference picture.In a word, reference picture herein is meant can be by the picture of other picture references, but not reference picture then be meant can be by the picture of other picture references.
Summary of the invention
Embodiments of the invention provide a kind of video recording method, and described video recording method is used for recording device.Described recording device receives first video data, and writes down the position of at least one the non-reference picture in described first video data.Then, described recording device judges whether described recording device the data congestion situation takes place.If judge that described data congestion situation takes place described recording device, then described data buffer abandons at least one non-reference picture of corresponding described position, to produce second video data.At last, described data buffer can be written to storage device with described second video data.
In an embodiment of the present invention, above-mentioned data congestion situation comprises following wherein a kind of situation at least: the data buffer in (1) described recording device is filled; (2) data buffer in the described recording device nearly is filled; (3) described first bit rate of video data is greater than threshold value.
In an embodiment of the present invention, above-mentioned video recording method more after abandoning at least one non-reference picture of corresponding described position, produces pseudo-picture, and described pseudo-picture is inserted described position, to produce described second video data.
Embodiments of the invention provide a kind of recording device, described recording device comprises receiving interface, non-reference picture position recording device, data buffer, image processor and storage device, wherein said non-reference picture position recording device is connected in described receiving interface, described data buffer is connected in described receiving interface, described image processor is connected in described data buffer and described non-reference picture position recording device, and described storage device is connected in described data buffer.Described receiving interface is in order to receive first video data, and described non-reference picture position recording device is in order to write down the position of at least one the non-reference picture in described first video data.Described data buffering is in order to cushion described first video data.Described image processor judges whether described recording device the data congestion situation takes place, if judge that described data congestion situation takes place described recording device, then described image processor indicates described data buffer to abandon at least one non-reference picture of corresponding described position, to produce second video data whereby.Described storage device is in order to be written to storage device with described second video data.
In an embodiment of the present invention, above-mentioned data congestion situation comprises following wherein a kind of situation at least: the data buffer in (1) described recording device is filled; (2) data buffer in the described recording device nearly is filled; (3) described first bit rate of video data is greater than threshold value.
In an embodiment of the present invention, described image processor more after abandoning at least one non-reference picture of corresponding described position, produces pseudo-picture, and described pseudo-picture is inserted described position, to produce described second video data.
Based on above-mentioned, video recording method that embodiments of the invention provided and recording device, when too high or data buffer may be filled or fill up in bit rate of video data, described video recording method and recording device can abandon non-reference picture, to produce a video data that does not have the non-reference picture that is dropped, perhaps produce a video data that replaces the non-reference picture that abandoned with pseudo-picture.The size of data of wherein said pseudo-picture is less than described non-reference picture.See through above-mentioned video recording method and recording device, the data volume that write the video data of storage device will significantly reduce, and during the video data in playing described storage device, does not very have the generation of mosaic in the broadcasting pictures.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is the system block diagrams of the recording device among the PVR.
Fig. 2 is the system block diagrams of the playing device among the PVR.
Fig. 3 is the system block diagrams of the recording device among the PVR that provides of embodiments of the invention.
Fig. 4 is the method flow diagram of the video recording method that provides of embodiments of the invention.
The main element symbol description:
100: recording device
110: frequency modulator
120,125: receiving interface
130: Video Decoder
135: audio decoder
140: data buffer
150: storage device
200: playing device
210: storage device
220: data buffer
230: receiving interface
240: Video Decoder
245: audio decoder
300: recording device
310: frequency modulator 320,340: receiving interface
330: Video Decoder
335: audio decoder
350: non-reference picture position recording device
360: image processor
370: data buffer
380: storage device
S400~S450: steps flow chart
Embodiment
Please refer to Fig. 3, Fig. 3 is the system block diagrams of the recording device among the PVR that provides of embodiments of the invention.The recording device 300 of described PVR comprises frequency modulator 310, receiving interface 320,340, Video Decoder 330, audio decoder 335, non-reference picture position recording device 350, image processor 360, data buffer 370 and storage device 380, wherein frequency modulator 310 is connected in receiving interface 320 and 340, receiving interface 120 is connected in Video Decoder 130 and audio decoder 135, non-reference picture position recording device 350 is connected in described receiving interface, data buffer 370 is connected in described receiving interface 340, image processor 360 is connected in data buffer 370 and non-reference picture position recording device 350, and storage device 380 is connected in data buffer 370.
Frequency modulator 310 is in order to the video data of the program selecting to receive, and receiving interface 320 can separate image data in the video data and speech data, and with image data and speech data is sent to Video Decoder 330 and audio decoder 335 is decoded.Receiving interface 340 is in order to receiving video data, and non-reference picture position recording device 350 is in order to the position of at least one the non-reference picture in the recording video data.Data buffer 370 comes from the video data of receiving interface in order to buffering.Image processor 360 judges whether recording device 300 the data congestion situation takes place, if the data congestion situation takes place in recording device 300, then image processor 360 designation data buffers 370 abandon at least one non-reference picture of correspondence position, to produce the video data through image processing whereby.When the data congestion situation took place recording device 300, storage device 380 was in order to be written to storage device 380 with treated video data.Above-mentioned data congestion situation comprises following wherein a kind of situation at least: the data buffer 370 in (1) described recording device 300 has been filled; (2) data buffer 370 in the described recording device 300 nearly is filled; (3) described bit rate of video data is greater than threshold value.
Be noted that at this that described data buffer 370 is filled nearly and be meant that the ratio that data buffer 370 is filled surpasses particular percentile that for example percent 80 of data buffer 370 buffer is filled.In addition, non-reference picture position recording device 350 position of being write down is original position and the end position that comprises described non-reference picture.Each picture in the video data all has corresponding header, therefore non-reference picture position recording device 350 can be learnt the original position and the end position of described non-reference picture from the header of non-reference picture, and the original position and the end position of non-reference picture are recorded in wherein, should want designation data buffer 370 to abandon which non-reference picture to inform image process unit 360.
In addition, the mean bit rate of the video data that described bit rate of video data is meant in special time to be imported greater than threshold value is greater than threshold value, so will cause behind a special time, the data buffer 370 in the described recording device 300 can be filled.More particularly, image processor 360 constantly detects the bit rate of video data of being imported, and whether the mean bit rate of judging the video data of being imported in the special time then is greater than particular value.If whether the mean bit rate of the video data of being imported in the special time is greater than particular value, then image processor 360 is thought behind special time, data buffer 370 in the described recording device 300 will be filled, and must carry out the action that abandons at least one non-reference picture at once.For instance, the mean bit rate of supposing first video data in per 20 seconds is A (mbit/), the writing speed of storage facilities is B (mbit/) (being generally fixed value concerning same equipment), then as A during greater than B, image processor 360 thinks that the data buffer 370 in the described recording device 300 will be filled through behind the special time.
If the data congestion situation does not take place recording device 300, then image processor 360 designation data buffers 370 directly are written to storage device 300 with original video data.Yet, too high in bit rate of video data, when perhaps data buffer 370 may be filled or fill up, then image processor 360 thinks that the data congestion situation takes place described recording device 300, therefore, image processor 360 designation data buffers 370 abandon at least one non-reference picture of correspondence position, to produce the video data through image processing whereby.In other words, too high in bit rate of video data, when perhaps data buffer 370 may be filled or fill up, described recording device 300 is not the data that at random abandon reference picture and non-reference, but optionally abandon non-reference picture, reducing the data volume of treated video data, and picture has the generation of mosaic when avoiding playing.
Image processor 360 directly designation data buffer 370 abandons at least one non-reference picture of correspondence position, and does not produce any new picture, the video data that just directly allows storage device 380 store after image processing.In other words, write to the video data of storage device 380 for not having the video data of the non-reference picture that is dropped.
But above-mentioned design may must could make that storage device 380 stored video datas are played by the new playing device of collocation design.Yet, in order to allow the directly stored video data after image processing of storage device 380 of present existing playing device, image processor 360 has more pseudo-picture generation apparatus (be not plotted in graphic in), this pseudo-picture generation apparatus in order at least one the non-reference picture that abandons corresponding described position at described data buffer after, produce pseudo-picture, and pseudo-picture inserted described position, to produce described video data through image processing.In other words, the video data that writes to storage device 380 is the video data that the pseudo-picture of use replaces the non-reference picture that is dropped, and described pseudo-picture is exactly the insertion picture that is used for inserting corresponding described position.
The size of data of pseudo-picture is less than the non-reference picture of the described position of correspondence, and pseudo-picture can be the forward direction reference picture, back of the reference of a non-reference picture institute last picture or the back picture to reference picture, non-reference picture in fact after decoding.Video specification with described recording device 300 is that employing MPEG-1 or Moving Picture Experts Group-2 are example, each macro block of originally pseudo-picture (Marco Block) guild is encoded as a section (Slice), each section all only encode first and last macro block, that is only there are first and last macro block that the real data crossfire is arranged, remaining macro block then is encoded to omission (Skipped) macro block, and does not have the real data crossfire.In addition, when first of each section of encoding and last macro block, only use the forward direction reference picture of the non-reference picture be dropped or back, and its motion vector and motion residual error are encoded to 0 entirely to reference picture.Thus, the forward direction reference picture of macro block meeting of the pseudo-picture that comes out of decoding and the non-reference picture that is dropped or afterwards just the same to the macro block of reference picture correspondence position.In addition, video specification with described recording device 300 is that employing MPEG-4 standard is an example, pseudo-picture can wholely be encoded as a section, each macro block in the section is when coding, only use forward direction reference picture or back to reference picture, wherein each macro block is encoded as and omits macro block (value of its not_coded can be set as 1).Thus, the forward direction reference picture of macro block meeting of the pseudo-picture that comes out of decoding and the non-reference picture that is dropped or afterwards just the same to the macro block of reference picture correspondence position.
Described Video Decoder 330 and audio decoder 335 present various video specification and the audio frequency specification of adopting, video specification for example is MPEG-1, MPEG-2, MPEG-4 or H.264 waits standard, the audio frequency specification for example is standards such as MP3 or WAV, and in addition described storage device 380 can be CD drive, hard disk, storage card or the flash memory etc. with instant burning function.
Then, please refer to Fig. 4, Fig. 4 is the method flow diagram of the video recording method that provides of embodiments of the invention.Described video recording method is to be used for above-mentioned recording device, and described recording device can be the recording device of PVR, but is not limited to this.In step S400, receiving interface receives first video data.In step S410, the position of at least one the non-reference picture in described first video data of non-reference picture position recording device, the position that wherein non-reference picture position recording device is write down is original position and the end position that comprises described non-reference picture.
Then, in step S420, image processor judges whether described recording device the data congestion situation takes place.Above-mentioned data congestion situation comprises following wherein a kind of situation at least: the data buffer in (1) described recording device is filled; (2) data buffer in the described recording device nearly is filled; (3) described bit rate of video data is greater than threshold value.Described data buffer nearly is filled and is meant that the ratio that data buffer is filled surpasses particular percentile, and for example percent 80 buffer is filled in the data buffer.As if described recording device whether the data congestion situation takes place, then execution in step S440; Otherwise, execution in step S430 then.
In step S440, image processor designation data buffer abandons at least one non-reference picture of corresponding described position, and produces pseudo-picture and be inserted into described position, with the non-reference picture that replaces being abandoned, and produces second video data in view of the above.As noted earlier, above-mentioned steps S440 is not in order to limit the present invention, in another embodiment, image processor directly designation data buffer abandons at least one non-reference picture of correspondence position, do not produce the non-reference picture that any new picture replacement is dropped, and produce second video data in view of the above.Then, in step S450, second video data is written to storage device.If the data congestion situation does not take place described recording device, then in step S430, first video data (not passing through any processing) directly is written to storage device.
The size of data of pseudo-picture is less than the non-reference picture of the described position of correspondence, and pseudo-picture can be the forward direction reference picture, back of the reference of non-reference picture institute in fact to reference picture, last picture or a back picture after decoding.Video specification with described recording device is that employing MPEG-1 or Moving Picture Experts Group-2 are example, each macro-block line of originally pseudo-picture can be encoded as a section, each section all only encode first and last macro block, that is only there are first and last macro block that the real data crossfire is arranged, remaining macro block then is encoded to the omission macro block, and does not have the real data crossfire.In addition, when first of each section of encoding and last macro block, only use the forward direction reference picture of the non-reference picture be dropped or back, and its motion vector and motion residual error are encoded to 0 entirely to reference picture.Thus, the forward direction reference picture of macro block meeting of the pseudo-picture that comes out of decoding and the non-reference picture that is dropped or afterwards just the same to the macro block of reference picture correspondence position.In addition, video specification with described recording device is that employing MPEG-4 standard is an example, pseudo-picture can wholely be encoded as a section, each macro block in the section is when coding, only use forward direction reference picture or back to reference picture, wherein each macro block is encoded as and omits macro block (value of its not_coded can be set as 1).Thus, the forward direction reference picture of macro block meeting of the pseudo-picture that comes out of decoding and the non-reference picture that is dropped or afterwards just the same to the macro block of reference picture correspondence position.
In sum, video recording method that embodiments of the invention provided and recording device, too high in bit rate of video data, when perhaps data buffer may be filled or be filled, described video recording method and recording device can abandon non-reference picture, and replace with the littler pseudo-picture of the size of data of a more original non-reference picture, to reduce the size of video data whereby.Therefore when using described video recording method, the data volume of video data that described recording device will write storage device is lower, and during the video data in broadcast institute writing station, does not very have the generation of mosaic in the broadcasting pictures.In addition, the video data that uses storage device that described video recording method writes is when playing, because described video recording method does not change the coding structure of video data, therefore can not increase decoding and the synchronous complexity of voice and video, and also not need the new playing device of additional designs could play video data in the said write storage device.In other words, use the video data of storage device that described video recording method writes to use the playing device of corresponding video specification to play.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.

Claims (16)

1. a video recording method is used for recording device, comprising:
Receive first video data;
Write down the position of at least one the non-reference picture in described first video data;
Judge whether described recording device the data congestion situation takes place;
If described data congestion situation takes place described recording device, then abandon at least one non-reference picture of corresponding described position, to produce second video data; And
Described second video data is written to storage device.
2. video recording method as claimed in claim 1 is characterized in that, described data congestion situation comprises following wherein a kind of situation at least:
Data buffer in the described recording device is filled;
Data buffer in the described recording device nearly is filled; And
Described first bit rate of video data is greater than threshold value.
3. video recording method as claimed in claim 1 is characterized in that, after abandoning at least one non-reference picture of corresponding described position, produces pseudo-picture, and described pseudo-picture is inserted described position, to produce described second video data.
4. video recording method as claimed in claim 3 is characterized in that, the size of data of described pseudo-picture is less than the described non-reference picture of the described position of correspondence.
5. video recording method as claimed in claim 3 is characterized in that, described pseudo-picture is essentially the non-reference picture institute reference of its correspondence after decoding forward direction reference picture, back is to last or a back picture of reference picture, corresponding non-reference picture.
6. video recording method as claimed in claim 1 is characterized in that, described position is the original position and the end position of described non-reference picture.
7. video recording method as claimed in claim 2, it is characterized in that, described data buffer nearly is filled and is meant that the ratio that data buffer is filled surpasses particular percentile, and described first bit rate of video data is meant that greater than threshold value the mean bit rate of described first video data in special time is greater than described threshold value.
8. video recording method as claimed in claim 1 is characterized in that, more comprises:
If described data congestion situation does not take place described recording device, then directly described first video data is written to described storage device.
9. recording device comprises:
Receiving interface is in order to receive first video data;
Non-reference picture position recording device is connected in described receiving interface, in order to write down the position of at least one the non-reference picture in described first video data;
Data buffer is connected in described receiving interface, in order to cushion described first video data;
Image processor, be connected in described data buffer and non-reference picture position recording device, in order to judge whether described recording device the data congestion situation takes place, wherein if described data congestion situation takes place in described recording device, then described image processor indicates described data buffer to abandon at least one non-reference picture of corresponding described position, to produce second video data whereby; And
Storage device is connected in described data buffer, and when described data buffer nearly is filled or is filled, described storage device is in order to be written to storage device with described second video data.
10. recording device as claimed in claim 9 is characterized in that, described data congestion situation comprises following wherein a kind of situation at least:
Data buffer in the described recording device is filled;
Data buffer in the described recording device nearly is filled; And
Described first bit rate of video data is greater than threshold value.
11. recording device as claimed in claim 9 is characterized in that, described image processor comprises:
One pseudo-double picture generation apparatus behind at least one the non-reference picture that abandons corresponding described position at described data buffer, produces pseudo-picture, and described pseudo-picture is inserted described position, to produce described second video data.
12. recording device as claimed in claim 11 is characterized in that, the size of data of described pseudo-picture is less than the described non-reference picture of the described position of correspondence.
13. video recording method as claimed in claim 11 is characterized in that, described pseudo-picture is essentially the reference of corresponding non-reference picture institute after decoding forward direction reference picture, back is to last or a back picture of reference picture, corresponding non-reference picture.
14. recording device as claimed in claim 9 is characterized in that, described position is the original position and the end position of described bi-directional predicted picture.
15. recording device as claimed in claim 10, it is characterized in that, described data buffer nearly is filled and is meant that the ratio that data buffer is filled surpasses particular percentile, and described first bit rate of video data is meant that greater than threshold value the mean bit rate of described first video data in special time is greater than described threshold value.
16. recording device as claimed in claim 9 is characterized in that, if described data congestion situation does not take place described recording device, then described image processor indicates described data buffer directly described first video data to be written to described storage device.
CN201010102835XA 2010-01-29 2010-01-29 Video recording method and video recording device Pending CN102143343A (en)

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CN103024327A (en) * 2011-09-28 2013-04-03 中怡(苏州)科技有限公司 Video-recording method and video-recording device

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Publication number Priority date Publication date Assignee Title
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Publication number Priority date Publication date Assignee Title
CN103024327A (en) * 2011-09-28 2013-04-03 中怡(苏州)科技有限公司 Video-recording method and video-recording device
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Application publication date: 20110803