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Mot : - Tags -/copyleft

Autres articles (46)

Support de tous types de médias

10 avril 2011

Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)
Contribute to translation

13 avril 2011

You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
To do this, we use the translation interface of SPIP where the all the language modules of MediaSPIP are available. Just subscribe to the mailing list and request further informantion on translation.
MediaSPIP is currently available in French and English (...)
Supporting all media types

13 avril 2011, par kent1

Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ... | 16

Sur d’autres sites (6826)

Nginx rtmp live stream with ffmpeg Transcoding , ffmpeg dont work

7 septembre 2016, par loip104

Hy i am trying to receive a stream convert and give out on rtmp

my nginx config

#user  nobody;

worker_processes  1;



error_log  logs/error.log debug;



events {

    worker_connections  1024;

}



rtmp {

        server {

                listen 1935;

                chunk_size 8192;



  application big {

                live on;

  exec ffmpeg -i rtmp://127.0.0.1/big/test -vcodec libx264 -preset veryfast -b:v 2000k -maxrate 2000k -bufsize 2000k -s 1280x720 -sws_flags lanczos -r 60 -acodec copy -f flv rtmp://127.0.0.1/live/test;

}



  application live {

          live on;



    }



 

        }

}

Her is the nginx log file , nginx start —> OBS connected

2016/09/07 20:57:49 [notice] 9841#0: using the "epoll" event method

2016/09/07 20:57:49 [notice] 9841#0: nginx/1.9.15

2016/09/07 20:57:49 [notice] 9841#0: built by gcc 4.9.2 (Debian 4.9.2-10) 

2016/09/07 20:57:49 [notice] 9841#0: OS: Linux 3.16.0-4-amd64

2016/09/07 20:57:49 [notice] 9841#0: getrlimit(RLIMIT_NOFILE): 65536:65536

2016/09/07 20:57:49 [notice] 9842#0: start worker processes

2016/09/07 20:57:49 [notice] 9842#0: start worker process 9843

2016/09/07 20:57:51 [info] 9843#0: *1 client connected '**.**.**.234'

2016/09/07 20:57:52 [info] 9843#0: *1 connect: app='live' args='' flashver='LNX 9,0,124,2' swf_url='' tc_url='rtmp://sb2.stream-booster.ovh:1935/live' page_url='' acodecs=4071 vcodecs=252 object_encoding=0, client: **.**.**.234, server: 0.0.0.0:1935

2016/09/07 20:57:52 [info] 9843#0: *1 createStream, client: **.**.**.234, server: 0.0.0.0:1935

2016/09/07 20:57:52 [info] 9843#0: *1 play: name='test' args='' start=-2000 duration=0 reset=0 silent=0, client: **.**.**.234, server: 0.0.0.0:1935

2016/09/07 20:58:17 [info] 9843#0: *2 client connected '**.**.**.234'

2016/09/07 20:58:17 [info] 9843#0: *2 connect: app='big' args='' flashver='FMLE/3.0 (compatible; obs-studi' swf_url='rtmp://sb2.***.ovh/big' tc_url='rtmp://sb2.***.ovh/big' page_url='' acodecs=0 vcodecs=0 object_encoding=0, client: **.**.**.234, server: 0.0.0.0:1935

2016/09/07 20:58:18 [info] 9843#0: *2 createStream, client: **.**.**.234, server: 0.0.0.0:1935

2016/09/07 20:58:18 [info] 9843#0: *2 publish: name='test' args='' type=live silent=0, client: **.**.**.234, server: 0.0.0.0:1935

2016/09/07 20:58:18 [info] 9843#0: *2 exec: starting managed child 'ffmpeg', client: **.**.**.234, server: 0.0.0.0:1935

2016/09/07 20:58:18 [info] 9843#0: *2 exec: child 9844 exited; ignoring, client: **.**.**.234, server: 0.0.0.0:1935

2016/09/07 20:58:18 [info] 9843#0: *2 exec: terminating child 9844, client: **.**.**.234, server: 0.0.0.0:1935

2016/09/07 20:58:18 [notice] 9843#0: signal 17 (SIGCHLD) received

2016/09/07 20:58:18 [notice] 9843#0: unknown process 9844 exited with code 1

2016/09/07 20:58:18 [info] 9843#0: epoll_wait() failed (4: Interrupted system call)

But i dont get a Output on "rtmp ://127.0.0.1/live/test"

if i start ffmpeg on terminal all work fine , i think nginx dont execute the command ?

how i get this ?

Streaming USB Webcam to YouTube Live - Raspberry Pi [migrated]

13 mai 2016, par ysoulja

all new here. Hoping someone can help.

I am trying to Stream a USB webcam to YouTube Live Events but having difficulty. I followed :

How to stream on YouTube using a Raspberry Pi ?

I have managed to get ffmpeg compiled and can run

ffmpeg -f v4l2 -framerate 25 -video_size 640x480 -i /dev/video0 -c:v     libx264 -b:v 700k -an -f flv rtmp://

It looks to me as the stream is working as I get the :

frame= 29 fps= 29 q=28.0 12kb time=00:00.05 bitrate=1189.0kbits

messages scrolling along however YouTube says "We are not receiving data from your encoder. Please make sure it is configured correctly in the Ingestion Settings page." While also saying "Good Health".

Can someone please assist ? Thanks

Edit : Some logs

Stream mapping:

Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))

Press [q] to stop, [?] for help

frame=    2 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=21 speed=   0x

frame=    2 fps=2.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=29 speed=   0x

Past duration 0.994804 too large

frame=   10 fps=6.6 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=30 speed=   0x

frame=   17 fps=8.4 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=30 speed=   0x

frame=   25 fps=9.9 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=30 speed=   0x 

frame=   32 fps= 11 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=30 speed=   0x 

frame=   40 fps= 11 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=30 speed=   0x

frame=   47 fps=8.9 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=30 speed=   0x

frame=   54 fps=8.8 q=24.0 size=      44kB time=00:00:02.12 bitrate= 169.6kbits/s dup=0 drop=30 s

Past duration 0.932655 too large

frame=   58 fps=8.1 q=16.0 size=     114kB time=00:00:02.33 bitrate= 401.6kbits/s dup=0 drop=30 s

frame=   61 fps=7.8 q=12.0 size=     283kB time=00:00:02.54 bitrate= 910.5kbits/s dup=0 drop=30 s 

frame=   62 fps=7.3 q=11.0 size=     360kB time=00:00:02.58 bitrate=1141.5kbits/s dup=0 drop=30 s    

frame=   63 fps=6.9 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=30 s

frame=   63 fps=6.6 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=67 s

frame=   63 fps=6.2 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=75 s    

frame=   63 fps=5.9 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=83 s

frame=   63 fps=5.7 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=90 s

frame=   63 fps=5.4 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=98 s

frame=   63 fps=5.2 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=105 

frame=   63 fps=5.0 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=113 

frame=   63 fps=4.8 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=120 

frame=   63 fps=4.6 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=128 

frame=   63 fps=4.5 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=136

frame=   63 fps=4.3 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=143  

frame=   63 fps=4.2 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=151 

frame=   63 fps=4.0 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=158 

frame=   63 fps=3.9 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=166 

frame=   63 fps=3.8 q=13.0 size=     414kB time=00:00:02.66 bitrate=1269.7kbits/s dup=0 drop=173

more logs

Stream mapping:

Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))

Press [q] to stop, [?] for help

frame=   49 fps= 13 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=20 speed=   0x

frame=   49 fps= 12 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=28 speed=   0x

frame=   61 fps= 11 q=24.0 size=      72kB time=00:00:00.54 bitrate=1090.9kbits/s dup=0 drop=30 s

frame=   56 fps= 12 q=26.0 size=      50kB time=00:00:00.20 bitrate=1976.8kbits/s dup=0 drop=30 s

frame=   65 fps= 11 q=22.0 size=     101kB time=00:00:00.79 bitrate=1046.9kbits/s dup=0 drop=30 s

frame=   69 fps= 10 q=20.0 size=     145kB time=00:00:01.08 bitrate=1097.6kbits/s dup=0 drop=30 s

frame=   73 fps=9.7 q=20.0 size=     213kB time=00:00:01.33 bitrate=1307.3kbits/s dup=0 drop=30 s

frame=   78 fps=9.7 q=22.0 size=     291kB time=00:00:01.66 bitrate=1431.6kbits/s dup=0 drop=30 s

frame=   79 fps=9.2 q=22.0 size=     301kB time=00:00:01.70 bitrate=1442.8kbits/s dup=0 drop=30 s

frame=   85 fps=9.0 q=23.0 size=     365kB time=00:00:02.12 bitrate=1407.8kbits/s dup=0 drop=30 s

frame=   91 fps=9.1 q=24.0 size=     402kB time=00:00:02.54 bitrate=1295.9kbits/s dup=0 drop=31 s

frame=   94 fps=8.8 q=24.0 size=     425kB time=00:00:02.70 bitrate=1285.3kbits/s dup=0 drop=33 s

frame=   98 fps=8.8 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=51 s

frame=   98 fps=8.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=73 s

frame=   98 fps=8.0 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=80 s

frame=   98 fps=7.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=88 s

frame=   98 fps=7.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=95 s

frame=   98 fps=7.1 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=103 

frame=   98 fps=6.9 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=110 

frame=   98 fps=6.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=118 

frame=   98 fps=6.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=126 

frame=   98 fps=6.2 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=133 

frame=   98 fps=6.0 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=141 

frame=   98 fps=5.9 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=148 

frame=   98 fps=5.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=156 

frame=   98 fps=5.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=164 

frame=   98 fps=5.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=171 

frame=   98 fps=5.2 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=179 

frame=   98 fps=5.1 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=186 

frame=   98 fps=5.0 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=194 

frame=   98 fps=4.8 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=202 

frame=   98 fps=4.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=209 

frame=   98 fps=4.6 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=217

frame=   98 fps=4.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=224 

frame=   98 fps=4.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=232 

frame=   98 fps=4.3 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=239 

frame=   98 fps=4.2 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=247 

frame=   98 fps=4.1 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=255 

frame=   98 fps=4.0 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=262 

frame=   98 fps=4.0 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=270 

frame=   98 fps=3.9 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=277 

frame=   98 fps=3.8 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=285 

frame=   98 fps=3.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=293 

frame=   98 fps=3.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=300 

frame=   98 fps=3.6 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=308 

frame=   98 fps=3.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=315 

frame=   98 fps=3.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=323 

frame=   98 fps=3.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=331 

frame=   98 fps=3.3 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=338 

frame=   98 fps=3.3 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=346 

frame=   98 fps=3.2 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=353 

frame=   98 fps=3.2 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=361 

frame=   98 fps=3.1 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=368 

frame=   98 fps=3.1 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=376 

frame=   98 fps=3.0 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=384 

frame=   98 fps=3.0 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=391 

frame=   98 fps=2.9 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=399 

frame=   98 fps=2.9 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=406 

frame=   98 fps=2.9 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=414 

frame=   98 fps=2.8 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=422 

frame=   98 fps=2.8 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=429 

frame=   98 fps=2.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=437 

frame=   98 fps=2.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=444 

frame=   98 fps=2.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=452 

frame=   98 fps=2.6 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=459 

frame=   98 fps=2.6 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=467 

frame=   98 fps=2.6 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=475 

frame=   98 fps=2.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=482 

frame=   98 fps=2.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=490 

frame=   98 fps=2.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=497 

frame=   98 fps=2.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=505 

frame=   98 fps=2.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=513 

frame=   98 fps=2.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=520 

frame=   98 fps=2.3 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=528 

frame=   98 fps=2.3 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=535 

frame=   98 fps=2.3 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=543 

frame=   98 fps=2.3 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=551 

frame=   98 fps=2.2 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=558 

frame=   98 fps=2.2 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=566 

frame=   98 fps=2.2 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=573 

frame=   98 fps=2.2 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=581 

frame=   98 fps=2.1 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=588 

frame=   98 fps=2.1 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=596 

frame=   98 fps=2.1 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=604 

frame=   98 fps=2.1 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=611 

frame=   98 fps=2.0 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=619 

frame=   98 fps=2.0 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=626 

frame=   98 fps=2.0 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=634 

frame=   98 fps=2.0 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=642 

frame=   98 fps=2.0 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=649 

frame=   98 fps=1.9 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=657 

frame=   98 fps=1.9 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=664 

frame=   98 fps=1.9 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=672 

frame=   98 fps=1.9 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=680 

frame=   98 fps=1.9 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=687 

frame=   98 fps=1.8 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=695 

frame=   98 fps=1.8 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=702 

frame=   98 fps=1.8 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=710 

frame=   98 fps=1.8 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=717 

frame=   98 fps=1.8 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=725 

frame=   98 fps=1.8 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=733 

frame=   98 fps=1.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=740 

frame=   98 fps=1.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=748 

frame=   98 fps=1.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=755 

frame=   98 fps=1.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=763

frame=   98 fps=1.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=778 

frame=   98 fps=1.7 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=786 

frame=   98 fps=1.6 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=793

frame=   98 fps=1.6 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=808 

frame=   98 fps=1.6 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=816 

frame=   98 fps=1.6 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=824 

frame=   98 fps=1.6 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=831 

frame=   98 fps=1.6 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=839 

frame=   98 fps=1.6 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=846 

frame=   98 fps=1.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=854 

frame=   98 fps=1.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=862 

frame=   98 fps=1.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=869 

frame=   98 fps=1.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=877 

frame=   98 fps=1.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=884 

frame=   98 fps=1.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=892 

frame=   98 fps=1.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=900 

frame=   98 fps=1.5 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=907 

frame=   98 fps=1.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=915 

frame=   98 fps=1.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=922 

frame=   98 fps=1.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=930 

frame=   98 fps=1.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=937 

frame=   98 fps=1.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=945 

frame=   98 fps=1.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=953 

frame=   98 fps=1.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=960 

frame=   98 fps=1.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=968 

frame=   98 fps=1.4 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=975

frame=   98 fps=1.3 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=991 

frame=   98 fps=1.3 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=998 

frame=   98 fps=1.3 q=20.0 size=     453kB time=00:00:03.00 bitrate=1237.0kbits/s dup=0 drop=1006

avformat/mov : fix seeking with HEVC open GOP files

18 février 2022, par Clément Bœsch

avformat/mov : fix seeking with HEVC open GOP files

This was tested with medias recorded from an iPhone XR and an iPhone 13.

Here is how a typical stream looks like in coding order :

┌────────┬─────┬─────┬──────────┐
│ sample | PTS | DTS | keyframe |
├────────┼─────┼─────┼──────────┤
┊ ┊ ┊ ┊ ┊
│ 53 │ 560 │ 510 │ No │
│ 54 │ 540 │ 520 │ No │
│ 55 │ 530 │ 530 │ No │
│ 56 │ 550 │ 540 │ No │
│ 57 │ 600 │ 550 │ Yes │
│ * 58 │ 580 │ 560 │ No │
│ * 59 │ 570 │ 570 │ No │
│ * 60 │ 590 │ 580 │ No │
│ 61 │ 640 │ 590 │ No │
│ 62 │ 620 │ 600 │ No │
┊ ┊ ┊ ┊ ┊

In composition/display order :

┌────────┬─────┬─────┬──────────┐
│ sample | PTS | DTS | keyframe |
├────────┼─────┼─────┼──────────┤
┊ ┊ ┊ ┊ ┊
│ 55 │ 530 │ 530 │ No │
│ 54 │ 540 │ 520 │ No │
│ 56 │ 550 │ 540 │ No │
│ 53 │ 560 │ 510 │ No │
│ * 59 │ 570 │ 570 │ No │
│ * 58 │ 580 │ 560 │ No │
│ * 60 │ 590 │ 580 │ No │
│ 57 │ 600 │ 550 │ Yes │
│ 63 │ 610 │ 610 │ No │
│ 62 │ 620 │ 600 │ No │
┊ ┊ ┊ ┊ ┊

Sample/frame 58, 59 and 60 are B-frames which actually depends on the
key frame (57). Here the key frame is not an IDR but a "CRA" (Clean
Random Access).

Initially, I thought I could rely on the sdtp box (independent and
disposable samples), but unfortunately :

sdtp[54] is_leading:0 sample_depends_on:1 sample_is_depended_on:0 sample_has_redundancy:0
sdtp[55] is_leading:0 sample_depends_on:1 sample_is_depended_on:2 sample_has_redundancy:0
sdtp[56] is_leading:0 sample_depends_on:1 sample_is_depended_on:2 sample_has_redundancy:0
sdtp[57] is_leading:0 sample_depends_on:2 sample_is_depended_on:0 sample_has_redundancy:0
sdtp[58] is_leading:0 sample_depends_on:1 sample_is_depended_on:0 sample_has_redundancy:0
sdtp[59] is_leading:0 sample_depends_on:1 sample_is_depended_on:2 sample_has_redundancy:0
sdtp[60] is_leading:0 sample_depends_on:1 sample_is_depended_on:2 sample_has_redundancy:0
sdtp[61] is_leading:0 sample_depends_on:1 sample_is_depended_on:0 sample_has_redundancy:0
sdtp[62] is_leading:0 sample_depends_on:1 sample_is_depended_on:0 sample_has_redundancy:0

The information that might have been useful here would have been
is_leading, but all the samples are set to 0 so this was unusable.

Instead, we need to rely on sgpd/sbgp tables. In my case the video track
contained 3 sgpd tables with the following grouping types : tscl, sync
and tsas. In the sync table we have the following 2 entries (only) :

sgpd.sync[1] : sync nal_unit_type:0x14
sgpd.sync[2] : sync nal_unit_type:0x15

(The count starts at 1 because 0 carries the undefined semantic, we'll
see that later in the reference table).

The NAL unit types presented here correspond to :

libavcodec/hevc.h : HEVC_NAL_IDR_N_LP = 20,
libavcodec/hevc.h : HEVC_NAL_CRA_NUT = 21,

In parallel, the sbgp sync table contains the following :

┌────┬───────┬─────┐
│ id │ count │ gdi │
├────┼───────┼─────┤
│ 0 │ 1 │ 1 │
│ 1 │ 56 │ 0 │
│ 2 │ 1 │ 2 │
│ 3 │ 59 │ 0 │
│ 4 │ 1 │ 2 │
│ 5 │ 59 │ 0 │
│ 6 │ 1 │ 2 │
│ 7 │ 59 │ 0 │
│ 8 │ 1 │ 2 │
│ 9 │ 59 │ 0 │
│ 10 │ 1 │ 2 │
│ 11 │ 11 │ 0 │
└────┴───────┴─────┘

The gdi column (group description index) directly refers to the index in
the sgpd.sync table. This means the first frame is an IDR, then we have
batches of undefined frames interlaced with CRA frames. No IDR ever
appears again (tried on a 30+ seconds sample).

With that information, we can build an heuristic using the presentation
order.

A few things needed to be introduced in this commit :

1. min_sample_duration is extracted from the stts : we need the minimal
step between sample in order to PTS-step backward to a valid point
2. In order to avoid a loop over the ctts table systematically during a
seek, we build an expanded list of sample offsets which will be used
to translate from DTS to PTS
3. An open_key_samples index to keep track of all the non-IDR key
frames ; for now it only supports HEVC CRA frames. We should probably
add BLA frames as well, but I don't have any sample so I prefered to
leave that for later

It is entirely possible I missed something obvious in my approach, but I
couldn't come up with a better solution. Also, as mentioned in the diff,
we could optimize is_open_key_sample(), but the linear scaling overhead
should be fine for now since it only happens in seek events.

Fixing this issue prevents sending broken packets to the decoder. With
FFmpeg hevc decoder the frames are skipped, with VideoToolbox the frames
are glitching.

[D H] libavformat/isom.h
[D H] libavformat/mov.c

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