Can H.264 stream in MP4 file contain Annex B startcode emulation?Parsing H264 in mdat MP4Live streaming through MP4How can i mux H264 stream into MP4 file via libavformatopen h.264 encoded stream and write the encoded AVPackets into mp4-fileConvert H.264 Annex B to MPEG-TSPossible Locations for Sequence/Picture Parameter Set(s) for H.264 StreamH.264 video streaming with AVFoundation on OS X?MP4 / MOV H.264 - determine bytestream standard (Annex B or AVC)Decoding H.264 NALU Stream C#Why does MP4 mdat atom not start with H.264 NALU start code?
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Can H.264 stream in MP4 file contain Annex B startcode emulation?
Parsing H264 in mdat MP4Live streaming through MP4How can i mux H264 stream into MP4 file via libavformatopen h.264 encoded stream and write the encoded AVPackets into mp4-fileConvert H.264 Annex B to MPEG-TSPossible Locations for Sequence/Picture Parameter Set(s) for H.264 StreamH.264 video streaming with AVFoundation on OS X?MP4 / MOV H.264 - determine bytestream standard (Annex B or AVC)Decoding H.264 NALU Stream C#Why does MP4 mdat atom not start with H.264 NALU start code?
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MP4 file (actually it's HLS stream that uses MP4 format) contains H.264 stream in AVC format: [NALU length][NALU data]. H.264 decoder requires Annex B format: [startcode][NALU data]. In general startcode emulation can happen in AVC format (e.g. 0x00000001 can occur inside encoded data). Does this mean that MP4 file format also can contain H.264 NALUs with startcode emulation? Or should emulation prevention be applied before packaging into MP4?
video-streaming mp4 h.264 http-live-streaming
asked Mar 28 at 15:03
Andriy TylychkoAndriy Tylychko
12.5k5 gold badges47 silver badges98 bronze badges
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MP4 file (actually it's HLS stream that uses MP4 format) contains H.264 stream in AVC format: [NALU length][NALU data]. H.264 decoder requires Annex B format: [startcode][NALU data]. In general startcode emulation can happen in AVC format (e.g. 0x00000001 can occur inside encoded data). Does this mean that MP4 file format also can contain H.264 NALUs with startcode emulation? Or should emulation prevention be applied before packaging into MP4?
video-streaming mp4 h.264 http-live-streaming
asked Mar 28 at 15:03
Andriy TylychkoAndriy Tylychko
12.5k5 gold badges47 silver badges98 bronze badges
3
Emulation prevention is always applied to remove 00 00 00-2 sequences from the encoded data (RBSP), this is unrelated to Annex B. Annex B format is about start codes as opposed to run-length encoding of NAL units.
– Roman R.
Mar 28 at 17:23
2
I think a picture here does a great visualization. Emulation prevention (the line with 0x03) is a part of NALU, and Annex B is, independently, a method of arranging NALUs into a byte stream.
– Roman R.
Mar 28 at 17:31
if you post this as an answer I'll be happy to accept it
– Andriy Tylychko
Mar 29 at 9:26
add a comment
|
MP4 file (actually it's HLS stream that uses MP4 format) contains H.264 stream in AVC format: [NALU length][NALU data]. H.264 decoder requires Annex B format: [startcode][NALU data]. In general startcode emulation can happen in AVC format (e.g. 0x00000001 can occur inside encoded data). Does this mean that MP4 file format also can contain H.264 NALUs with startcode emulation? Or should emulation prevention be applied before packaging into MP4?
video-streaming mp4 h.264 http-live-streaming
asked Mar 28 at 15:03
Andriy TylychkoAndriy Tylychko
12.5k5 gold badges47 silver badges98 bronze badges
MP4 file (actually it's HLS stream that uses MP4 format) contains H.264 stream in AVC format: [NALU length][NALU data]. H.264 decoder requires Annex B format: [startcode][NALU data]. In general startcode emulation can happen in AVC format (e.g. 0x00000001 can occur inside encoded data). Does this mean that MP4 file format also can contain H.264 NALUs with startcode emulation? Or should emulation prevention be applied before packaging into MP4?
video-streaming mp4 h.264 http-live-streaming
video-streaming mp4 h.264 http-live-streaming
asked Mar 28 at 15:03
Andriy TylychkoAndriy Tylychko
12.5k5 gold badges47 silver badges98 bronze badges
asked Mar 28 at 15:03
Andriy TylychkoAndriy Tylychko
12.5k5 gold badges47 silver badges98 bronze badges
edited Mar 28 at 16:31
Andriy Tylychko
asked Mar 28 at 15:03
Andriy TylychkoAndriy Tylychko
12.5k5 gold badges47 silver badges98 bronze badges
asked Mar 28 at 15:03
Andriy TylychkoAndriy Tylychko
12.5k5 gold badges47 silver badges98 bronze badges
asked Mar 28 at 15:03
Andriy TylychkoAndriy Tylychko
12.5k5 gold badges47 silver badges98 bronze badges
12.5k5 gold badges47 silver badges98 bronze badges
3
Emulation prevention is always applied to remove 00 00 00-2 sequences from the encoded data (RBSP), this is unrelated to Annex B. Annex B format is about start codes as opposed to run-length encoding of NAL units.
– Roman R.
Mar 28 at 17:23
2
I think a picture here does a great visualization. Emulation prevention (the line with 0x03) is a part of NALU, and Annex B is, independently, a method of arranging NALUs into a byte stream.
– Roman R.
Mar 28 at 17:31
if you post this as an answer I'll be happy to accept it
– Andriy Tylychko
Mar 29 at 9:26
add a comment
|
3
Emulation prevention is always applied to remove 00 00 00-2 sequences from the encoded data (RBSP), this is unrelated to Annex B. Annex B format is about start codes as opposed to run-length encoding of NAL units.
– Roman R.
Mar 28 at 17:23
2
I think a picture here does a great visualization. Emulation prevention (the line with 0x03) is a part of NALU, and Annex B is, independently, a method of arranging NALUs into a byte stream.
– Roman R.
Mar 28 at 17:31
if you post this as an answer I'll be happy to accept it
– Andriy Tylychko
Mar 29 at 9:26
3
3
Emulation prevention is always applied to remove 00 00 00-2 sequences from the encoded data (RBSP), this is unrelated to Annex B. Annex B format is about start codes as opposed to run-length encoding of NAL units.
– Roman R.
Mar 28 at 17:23
Emulation prevention is always applied to remove 00 00 00-2 sequences from the encoded data (RBSP), this is unrelated to Annex B. Annex B format is about start codes as opposed to run-length encoding of NAL units.
– Roman R.
Mar 28 at 17:23
2
2
I think a picture here does a great visualization. Emulation prevention (the line with 0x03) is a part of NALU, and Annex B is, independently, a method of arranging NALUs into a byte stream.
– Roman R.
Mar 28 at 17:31
I think a picture here does a great visualization. Emulation prevention (the line with 0x03) is a part of NALU, and Annex B is, independently, a method of arranging NALUs into a byte stream.
– Roman R.
Mar 28 at 17:31
if you post this as an answer I'll be happy to accept it
– Andriy Tylychko
Mar 29 at 9:26
if you post this as an answer I'll be happy to accept it
– Andriy Tylychko
Mar 29 at 9:26
add a comment
|
1 Answer
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Emulation prevention is always applied to remove 00 00 00-02 sequences from the encoded data (RBSP), so this is unrelated to Annex B: H.264 Annex B format is about start code prefixes prepending NAL units in byte-stream format as opposed to unit lengths.
A cheat sheet on this:
Emulation prevention is line 2 with 0x03 values, and Annex B is the bottom line on the image above.
answered Mar 29 at 11:15
Roman R.Roman R.
59k4 gold badges71 silver badges118 bronze badges
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Emulation prevention is always applied to remove 00 00 00-02 sequences from the encoded data (RBSP), so this is unrelated to Annex B: H.264 Annex B format is about start code prefixes prepending NAL units in byte-stream format as opposed to unit lengths.
A cheat sheet on this:
Emulation prevention is line 2 with 0x03 values, and Annex B is the bottom line on the image above.
answered Mar 29 at 11:15
Roman R.Roman R.
59k4 gold badges71 silver badges118 bronze badges
add a comment
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Emulation prevention is always applied to remove 00 00 00-02 sequences from the encoded data (RBSP), so this is unrelated to Annex B: H.264 Annex B format is about start code prefixes prepending NAL units in byte-stream format as opposed to unit lengths.
A cheat sheet on this:
Emulation prevention is line 2 with 0x03 values, and Annex B is the bottom line on the image above.
answered Mar 29 at 11:15
Roman R.Roman R.
59k4 gold badges71 silver badges118 bronze badges
add a comment
|
Emulation prevention is always applied to remove 00 00 00-02 sequences from the encoded data (RBSP), so this is unrelated to Annex B: H.264 Annex B format is about start code prefixes prepending NAL units in byte-stream format as opposed to unit lengths.
A cheat sheet on this:
Emulation prevention is line 2 with 0x03 values, and Annex B is the bottom line on the image above.
answered Mar 29 at 11:15
Roman R.Roman R.
59k4 gold badges71 silver badges118 bronze badges
Emulation prevention is always applied to remove 00 00 00-02 sequences from the encoded data (RBSP), so this is unrelated to Annex B: H.264 Annex B format is about start code prefixes prepending NAL units in byte-stream format as opposed to unit lengths.
A cheat sheet on this:
Emulation prevention is line 2 with 0x03 values, and Annex B is the bottom line on the image above.
answered Mar 29 at 11:15
Roman R.Roman R.
59k4 gold badges71 silver badges118 bronze badges
answered Mar 29 at 11:15
Roman R.Roman R.
59k4 gold badges71 silver badges118 bronze badges
answered Mar 29 at 11:15
Roman R.Roman R.
59k4 gold badges71 silver badges118 bronze badges
answered Mar 29 at 11:15
Roman R.Roman R.
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Emulation prevention is always applied to remove 00 00 00-2 sequences from the encoded data (RBSP), this is unrelated to Annex B. Annex B format is about start codes as opposed to run-length encoding of NAL units.
– Roman R.
Mar 28 at 17:23
2
I think a picture here does a great visualization. Emulation prevention (the line with 0x03) is a part of NALU, and Annex B is, independently, a method of arranging NALUs into a byte stream.
– Roman R.
Mar 28 at 17:31
if you post this as an answer I'll be happy to accept it
– Andriy Tylychko
Mar 29 at 9:26