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    13 septembre 2013

    Jolie sélection multiple
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    2 mars 2010, par

    Le plugin de Gestion de mutualisation permet de gérer les différents canaux de mediaspip depuis un site maître. Il a pour but de fournir une solution pure SPIP afin de remplacer cette ancienne solution.
    Installation basique
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  • How to adjust mpeg 2 ts start time with ffmpeg ?

    29 juin 2015, par Maxim Kornienko

    I’m writing simple HLS (Http Live Streaming) java server to live cast (really live, not on demand) screenshow + voice. I constantly get chunks of image frames and audio samples as input to my service and produce mpeg 2 ts files + m3u8 playlist web page as output. The workflow is the following :

    1. Collect (buffer) source video frames and audio for certain period of time
    2. Convert series of video frames to h.264 encoded video file
    3. Convert audio samples to mp3 audio file

    4. Merge them to .ts file with ffmpeg command

      ffmpeg -i audio.mp3 -i video.mp4 -f mpegts -c:a copy -c:v copy -vprofile main -level:v 4.0 -vbsf h264_mp4toannexb -flags -global_header segment.ts

    5. Publish several .ts files on m3u8 playlist.

    The problem is resulting playlist interrupts after first segment is played. VLC logs following error :

    freetype error: Breaking unbreakable line
    
ts error: libdvbpsi (PSI decoder): TS discontinuity (received 0, expected 4) for PID 17
    
ts error: libdvbpsi (PSI decoder): TS duplicate (received 0, expected 1) for PID 0
    
ts error: libdvbpsi (PSI decoder): TS duplicate (received 0, expected 1) for PID 4096
    
core error: ES_OUT_SET_(GROUP_)PCR is called too late (pts_delay increased to 1000 ms)
    
core error: ES_OUT_RESET_PCR called
    
core error: Could not convert timestamp 185529572000
    
ts error: libdvbpsi (PSI decoder): TS discontinuity (received 0, expected 4) for PID 17
    
ts error: libdvbpsi (PSI decoder): TS duplicate (received 0, expected 1) for PID 0
    
ts error: libdvbpsi (PSI decoder): TS duplicate (received 0, expected 1) for PID 4096
    
core error: ES_OUT_SET_(GROUP_)PCR is called too late (jitter of 8653 ms ignored)
    
core error: Could not get display date for timestamp 0
    
core error: Could not convert timestamp 185538017000
    
core error: Could not convert timestamp 185538267000
    
core error: Could not convert timestamp 185539295977
    
...

    I guess the reason is that start time of segments do not belong to one stream, but it’s impossible to concat and resegment (with ffmepg -f segment) whole stream once new chunk is added. Tried adding #EXT-X-DISCONTINUITY tag to playlist as suggested here but it didn’t help. When I ffprobe them I get :

    Input #0, mpegts, from '26.ts':
    
Duration: 00:00:10.02, start: 1.876978, bitrate: 105 kb/s
    
Program 1
    
Metadata:
    
  service_name    : Service01
    
  service_provider: FFmpeg
    
Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 640x640, 4 fps, 4 tbr, 90k tbn, 8 tbc
    
Stream #0:1[0x101]: Audio: mp3 ([3][0][0][0] / 0x0003), 48000 Hz, mono, s16p, 64 kb/s  

    Where start value in line Duration: 00:00:10.02, start: 1.876978, bitrate: 105 kb/s is more or less equal for all segments.
    When I check segments from available proven-to-work playlists (like http://vevoplaylist-live.hls.adaptive.level3.net/vevo/ch1/appleman.m3u8) they all have diffrenet start values for each segment, for example :

    Input #0, mpegts, from 'segm150518140104572-424570.ts':
    
Duration: 00:00:06.17, start: 65884.808689, bitrate: 479 kb/s
    
Program 257
    
Stream #0:0[0x20]: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p, 320x180 [SAR 1:1 DAR 16:9], 30 fps, 29.97 tbr, 90k tbn, 60 tbc
    
Stream #0:1[0x21]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 115 kb/s
    
Stream #0:2[0x22]: Data: timed_id3 (ID3  / 0x20334449)

    and the next after it

    Input #0, mpegts, from 'segm150518140104572-424571.ts':
    
Duration: 00:00:06.22, start: 65890.814689, bitrate: 468 kb/s
    
Program 257
    
Stream #0:0[0x20]: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p, 320x180 [SAR 1:1 DAR 16:9], 30 fps, 29.97 tbr, 90k tbn, 60 tbc
    
Stream #0:1[0x21]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 124 kb/s
    
Stream #0:2[0x22]: Data: timed_id3 (ID3  / 0x20334449)

    differ in the way that start time of segm150518140104572-424571.ts is equal to start time + duration of segm150518140104572-424570.ts.

    How could this start value be adjusted with ffmpeg ? Or maybe my whole aproach is wrong ? Unfortunately I couldn’t find on the internet working example of live (not on demand) video service implemented with ffmepg.

  • How to adjust mpeg 2 ts start time with ffmpeg ?

    24 juillet 2019, par Maxim Kornienko

    I’m writing simple HLS (Http Live Streaming) java server to live cast (really live, not on demand) screenshow + voice. I constantly get chunks of image frames and audio samples as input to my service and produce mpeg 2 ts files + m3u8 playlist web page as output. The workflow is the following :

    1. Collect (buffer) source video frames and audio for certain period of time
    2. Convert series of video frames to h.264 encoded video file
    3. Convert audio samples to mp3 audio file

    4. Merge them to .ts file with ffmpeg command

      ffmpeg -i audio.mp3 -i video.mp4 -f mpegts -c:a copy -c:v copy -vprofile main -level:v 4.0 -vbsf h264_mp4toannexb -flags -global_header segment.ts

    5. Publish several .ts files on m3u8 playlist.

    The problem is resulting playlist interrupts after first segment is played. VLC logs following error :

    freetype error: Breaking unbreakable line
    
ts error: libdvbpsi (PSI decoder): TS discontinuity (received 0, expected 4) for PID 17
    
ts error: libdvbpsi (PSI decoder): TS duplicate (received 0, expected 1) for PID 0
    
ts error: libdvbpsi (PSI decoder): TS duplicate (received 0, expected 1) for PID 4096
    
core error: ES_OUT_SET_(GROUP_)PCR is called too late (pts_delay increased to 1000 ms)
    
core error: ES_OUT_RESET_PCR called
    
core error: Could not convert timestamp 185529572000
    
ts error: libdvbpsi (PSI decoder): TS discontinuity (received 0, expected 4) for PID 17
    
ts error: libdvbpsi (PSI decoder): TS duplicate (received 0, expected 1) for PID 0
    
ts error: libdvbpsi (PSI decoder): TS duplicate (received 0, expected 1) for PID 4096
    
core error: ES_OUT_SET_(GROUP_)PCR is called too late (jitter of 8653 ms ignored)
    
core error: Could not get display date for timestamp 0
    
core error: Could not convert timestamp 185538017000
    
core error: Could not convert timestamp 185538267000
    
core error: Could not convert timestamp 185539295977
    
...

    I guess the reason is that start time of segments do not belong to one stream, but it’s impossible to concat and resegment (with ffmepg -f segment) whole stream once new chunk is added. Tried adding #EXT-X-DISCONTINUITY tag to playlist as suggested here but it didn’t help. When I ffprobe them I get :

    Input #0, mpegts, from '26.ts':
    
Duration: 00:00:10.02, start: 1.876978, bitrate: 105 kb/s
    
Program 1
    
Metadata:
    
  service_name    : Service01
    
  service_provider: FFmpeg
    
Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 640x640, 4 fps, 4 tbr, 90k tbn, 8 tbc
    
Stream #0:1[0x101]: Audio: mp3 ([3][0][0][0] / 0x0003), 48000 Hz, mono, s16p, 64 kb/s  

    Where start value in line Duration: 00:00:10.02, start: 1.876978, bitrate: 105 kb/s is more or less equal for all segments.
    When I check segments from available proven-to-work playlists (like http://vevoplaylist-live.hls.adaptive.level3.net/vevo/ch1/appleman.m3u8) they all have diffrenet start values for each segment, for example :

    Input #0, mpegts, from 'segm150518140104572-424570.ts':
    
Duration: 00:00:06.17, start: 65884.808689, bitrate: 479 kb/s
    
Program 257
    
Stream #0:0[0x20]: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p, 320x180 [SAR 1:1 DAR 16:9], 30 fps, 29.97 tbr, 90k tbn, 60 tbc
    
Stream #0:1[0x21]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 115 kb/s
    
Stream #0:2[0x22]: Data: timed_id3 (ID3  / 0x20334449)

    and the next after it

    Input #0, mpegts, from 'segm150518140104572-424571.ts':
    
Duration: 00:00:06.22, start: 65890.814689, bitrate: 468 kb/s
    
Program 257
    
Stream #0:0[0x20]: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p, 320x180 [SAR 1:1 DAR 16:9], 30 fps, 29.97 tbr, 90k tbn, 60 tbc
    
Stream #0:1[0x21]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 124 kb/s
    
Stream #0:2[0x22]: Data: timed_id3 (ID3  / 0x20334449)

    differ in the way that start time of segm150518140104572-424571.ts is equal to start time + duration of segm150518140104572-424570.ts.

    How could this start value be adjusted with ffmpeg ? Or maybe my whole aproach is wrong ? Unfortunately I couldn’t find on the internet working example of live (not on demand) video service implemented with ffmepg.

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