Re: [FFmpeg-trac] #1312(undetermined:open): FFmpeg doesn't handle bitrate transition on some mpeg-ts stream
#1312: FFmpeg doesn't handle bitrate transition on some mpeg-ts stream -+- Reporter: jyavenard|Owner: Type: enhancement | Status: open Priority: normal |Component: Version: git-master | undetermined Keywords: | Resolution: Blocking: | Blocked By: Analyzed by developer: 0| Reproduced by developer: 0 -+- Comment (by cehoyos): Please allow me to rephrase my badly worded question: Is there a player that can play the streams that contain stream 1 and another stream? If not, is there any reason to assume the resulting (combined) stream is valid? -- Ticket URL: https://ffmpeg.org/trac/ffmpeg/ticket/1312#comment:9 FFmpeg http://ffmpeg.org FFmpeg issue tracker ___ FFmpeg-trac mailing list FFmpeg-trac@avcodec.org http://avcodec.org/mailman/listinfo/ffmpeg-trac
Re: [FFmpeg-trac] #1312(undetermined:open): FFmpeg doesn't handle bitrate transition on some mpeg-ts stream
#1312: FFmpeg doesn't handle bitrate transition on some mpeg-ts stream -+- Reporter: jyavenard|Owner: Type: enhancement | Status: open Priority: normal |Component: Version: git-master | undetermined Keywords: | Resolution: Blocking: | Blocked By: Analyzed by developer: 0| Reproduced by developer: 0 -+- Comment (by jyavenard): then the answer is yes. This type of stream could theorically occur when you are streaming HTTP live streaming. This stream for example: http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8 on an iPhone or iPad, it starts streaming from the bipbop1 stream, then realise that there is sufficient bandwidth and change to a higher bitrate stream (bipbop2, 3 or 4). So what you see is bipbop1 for a few seconds, and then it switch to another one. it works. For a player, it is possible to reset the decoder on the fly as you can detect the change of streams, but say you are recording the stream content instead, you would be unable to play back the resulting mpeg-ts. MythTV now allows to record HLS stream, and can do switch of streams on the fly, according to the available bandwidth. That no current player is able to manage that mpeg-ts doesn't mean it can't be done :) -- Ticket URL: https://ffmpeg.org/trac/ffmpeg/ticket/1312#comment:10 FFmpeg http://ffmpeg.org FFmpeg issue tracker ___ FFmpeg-trac mailing list FFmpeg-trac@avcodec.org http://avcodec.org/mailman/listinfo/ffmpeg-trac
Re: [FFmpeg-trac] #1312(undetermined:open): FFmpeg doesn't handle bitrate transition on some mpeg-ts stream
#1312: FFmpeg doesn't handle bitrate transition on some mpeg-ts stream -+- Reporter: jyavenard|Owner: Type: enhancement | Status: open Priority: normal |Component: Version: git-master | undetermined Keywords: | Resolution: Blocking: | Blocked By: Analyzed by developer: 0| Reproduced by developer: 0 -+- Comment (by cehoyos): Replying to [comment:10 jyavenard]: That no current player is able to manage that mpeg-ts doesn't mean it can't be done :) I did not try to imply this, on the contrary, afaict, FFmpeg supports changing from 2 to 3 or 4, from 3 to 2 or 4 and from 4 to 2 or 3 fine. Imo, this suggests that there might be a problem with stream 1. -- Ticket URL: https://ffmpeg.org/trac/ffmpeg/ticket/1312#comment:11 FFmpeg http://ffmpeg.org FFmpeg issue tracker ___ FFmpeg-trac mailing list FFmpeg-trac@avcodec.org http://avcodec.org/mailman/listinfo/ffmpeg-trac
Re: [FFmpeg-trac] #1312(undetermined:open): FFmpeg doesn't handle bitrate transition on some mpeg-ts stream
#1312: FFmpeg doesn't handle bitrate transition on some mpeg-ts stream -+- Reporter: jyavenard|Owner: Type: enhancement | Status: open Priority: normal |Component: Version: git-master | undetermined Keywords: | Resolution: Blocking: | Blocked By: Analyzed by developer: 0| Reproduced by developer: 0 -+- Comment (by jyavenard): If you use the default multi-threaded h264 decoder, ffmpeg doesn't handle any of them... mplayer does the change on the fly by resetting the decoder, but it's rather heavy handed and shouldn't be necessary -- Ticket URL: https://ffmpeg.org/trac/ffmpeg/ticket/1312#comment:12 FFmpeg http://ffmpeg.org FFmpeg issue tracker ___ FFmpeg-trac mailing list FFmpeg-trac@avcodec.org http://avcodec.org/mailman/listinfo/ffmpeg-trac
Re: [FFmpeg-trac] #1312(undetermined:open): FFmpeg doesn't handle bitrate transition on some mpeg-ts stream
#1312: FFmpeg doesn't handle bitrate transition on some mpeg-ts stream -+- Reporter: jyavenard|Owner: Type: enhancement | Status: open Priority: normal |Component: Version: git-master | undetermined Keywords: | Resolution: Blocking: | Blocked By: Analyzed by developer: 0| Reproduced by developer: 0 -+- Comment (by jyavenard): bipbop1.ts on its own ; almost everyone will play it. For one transitioning from or to bipbop1 ; then I don't know. Neither mplayer, ffmpeg or Quicktime will play them. -- Ticket URL: https://ffmpeg.org/trac/ffmpeg/ticket/1312#comment:8 FFmpeg http://ffmpeg.org FFmpeg issue tracker ___ FFmpeg-trac mailing list FFmpeg-trac@avcodec.org http://avcodec.org/mailman/listinfo/ffmpeg-trac
Re: [FFmpeg-trac] #1312(undetermined:open): FFmpeg doesn't handle bitrate transition on some mpeg-ts stream
#1312: FFmpeg doesn't handle bitrate transition on some mpeg-ts stream -+- Reporter: jyavenard|Owner: Type: enhancement | Status: open Priority: normal |Component: Version: git-master | undetermined Keywords: | Resolution: Blocking: | Blocked By: Analyzed by developer: 0| Reproduced by developer: 0 -+- Changes (by cehoyos): * keywords: segments = * version: unspecified = git-master Comment: Replying to [ticket:1312 jyavenard]: QuickTime/Safari can play all but VBR streams with stream 1 (eg: bipbop12, bipob21, bipbop1234, bipbop4321) Is there a player that can play the streams that contain stream 1? -- Ticket URL: https://ffmpeg.org/trac/ffmpeg/ticket/1312#comment:7 FFmpeg http://ffmpeg.org FFmpeg issue tracker ___ FFmpeg-trac mailing list FFmpeg-trac@avcodec.org http://avcodec.org/mailman/listinfo/ffmpeg-trac
Re: [FFmpeg-trac] #1312(undetermined:open): FFmpeg doesn't handle bitrate transition on some mpeg-ts stream
#1312: FFmpeg doesn't handle bitrate transition on some mpeg-ts stream
-+-
Reporter: jyavenard|Owner:
Type: enhancement | Status: open
Priority: normal |Component:
Version: unspecified | undetermined
Keywords: segments | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0| Reproduced by developer: 0
-+-
Comment (by jyavenard):
The problem isn't in ffplay, but with ffmpeg libs (precisely libavcodec
H264 decoder)
Again, I only mentioned ffplay because I could easily reproduce the
problem there too, same symptoms
It would have only taken 30s of your time to reproduce the problem.
The work around for the time being is to detect manually the change of
resolution, close the decoder, and re-open it.
e.g.:
{{{
// definition: AVStream *stream;
if (stream-codec-codec)
avcodec_close(stream-codec);
AVCodec *codec = avcodec_find_decoder(stream-codec-codec_id);
avcodec_open2(stream-codec, codec, NULL);
}}}
--
Ticket URL: https://ffmpeg.org/trac/ffmpeg/ticket/1312#comment:5
FFmpeg http://ffmpeg.org
FFmpeg issue tracker
___
FFmpeg-trac mailing list
FFmpeg-trac@avcodec.org
http://avcodec.org/mailman/listinfo/ffmpeg-trac
Re: [FFmpeg-trac] #1312(undetermined:open): FFmpeg doesn't handle bitrate transition on some mpeg-ts stream
#1312: FFmpeg doesn't handle bitrate transition on some mpeg-ts stream -+- Reporter: jyavenard|Owner: Type: enhancement | Status: open Priority: normal |Component: Version: unspecified | undetermined Keywords: segments | Resolution: Blocking: | Blocked By: Analyzed by developer: 0| Reproduced by developer: 0 -+- Changes (by mjs973): * keywords: = segments * status: new = open * type: defect = enhancement Comment: You should provide more information if you want to get someone else interested in looking at this problem. Your bug description is ffplay fails. That is too little information. You don't even say if you are talking about audio or video. What is the failure you see or hear? The more detailed, the better. What characteristic changes in these input files (that might cause trouble)? At the very least, give us an 'ffmpeg -i infile' dump for files 1-4. -- Ticket URL: https://ffmpeg.org/trac/ffmpeg/ticket/1312#comment:2 FFmpeg http://ffmpeg.org FFmpeg issue tracker ___ FFmpeg-trac mailing list FFmpeg-trac@avcodec.org http://avcodec.org/mailman/listinfo/ffmpeg-trac
Re: [FFmpeg-trac] #1312(undetermined:open): FFmpeg doesn't handle bitrate transition on some mpeg-ts stream
#1312: FFmpeg doesn't handle bitrate transition on some mpeg-ts stream
-+-
Reporter: jyavenard|Owner:
Type: enhancement | Status: open
Priority: normal |Component:
Version: unspecified | undetermined
Keywords: segments | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0| Reproduced by developer: 0
-+-
Comment (by jyavenard):
Sorry, I thought it was self-explanatory that ffplay fails to handle the
transitions occurring at 10, 20 or 30s (whenever there's a bitrate or
resolution change) depending on the sample file played.
The samples are mpeg-ts file with a H264 video stream and a AAC mono audio
stream.
Every 10s, the H264 stream change, either just the bitrate change, or the
resolution (and as such bitrate) change.
it's the whole avcodec_decode_video2 that fails at the transition between
bitstreams change and/or video resolution transition.
avcodec_decode_video2 will just return an error as soon as you reach the
transition (exactly occurring at 10, 20 or 30s in the samples provided
I only mentioned ffplay failing, as an example on how to easily reproduce
the problem.
This is not an enhancement request.. This is a bug !
The H264 decoder will crap out when the H264 stream changes, and you can't
recover from that error.
{{{
[h264 @ 0x7fba43843600] Width/height/bit depth/chroma idc changing with
threads is not implemented. Update your FFmpeg version to the newest one
from Git. If the problem still occurs, it means that your file has a
feature which has not been implemented.
[h264 @ 0x7fba43843600] decode_slice_header error
[h264 @ 0x7fba43843600] Width/height/bit depth/chroma idc changing with
threads is not implemented. Update your FFmpeg version to the newest one
from Git. If the problem still occurs, it means that your file has a
feature which has not been implemented.
[h264 @ 0x7fba43843600] decode_slice_header error
[h264 @ 0x7fba43843600] Width/height/bit depth/chroma idc changing with
threads is not implemented. Update your FFmpeg version to the newest one
from Git. If the problem still occurs, it means that your file has a
feature which has not been implemented.
}}}
It's also not possible to detect the new resolution/bitrate change before
avcodec_decode_video2 fails. so one can't take proactive measure to
perform some kind of reset.
--
Ticket URL: https://ffmpeg.org/trac/ffmpeg/ticket/1312#comment:3
FFmpeg http://ffmpeg.org
FFmpeg issue tracker
___
FFmpeg-trac mailing list
FFmpeg-trac@avcodec.org
http://avcodec.org/mailman/listinfo/ffmpeg-trac
Re: [FFmpeg-trac] #1312(undetermined:open): FFmpeg doesn't handle bitrate transition on some mpeg-ts stream
#1312: FFmpeg doesn't handle bitrate transition on some mpeg-ts stream -+- Reporter: jyavenard|Owner: Type: enhancement | Status: open Priority: normal |Component: Version: unspecified | undetermined Keywords: segments | Resolution: Blocking: | Blocked By: Analyzed by developer: 0| Reproduced by developer: 0 -+- Comment (by cehoyos): Is the problem only reproducible with ffplay or also with ffmpeg? If it is reproducible with ffmpeg, please do not report the problem for ffplay (ffplay depends on an external library that is known to contain bugs, so ffmpeg is the primary application). In any case: Complete, uncut console output missing. -- Ticket URL: https://ffmpeg.org/trac/ffmpeg/ticket/1312#comment:4 FFmpeg http://ffmpeg.org FFmpeg issue tracker ___ FFmpeg-trac mailing list FFmpeg-trac@avcodec.org http://avcodec.org/mailman/listinfo/ffmpeg-trac
