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• FFmpeg (libav) is taking a lot of time to execute avformat_open_input over a master with few variants

  9 octobre 2023, par forlayo

  I am trying to use libav to demux an HLS stream from youtube, it works so far but my problem is that the call to avformat_open_input takes A LOT of time, sometimes even 1 minute.

  


  Doing same with Exoplayer (for example) it works without any issues.. I have the feeling of missing something big on the usage of libav for hls demuxing..

  


  The master file that I am using looks like the following :

  


  #EXTM3U
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-MEDIA:URI="http://localhost:35835/itag/233/mediadata.m3u8",TYPE=AUDIO,GROUP-ID="233",DEFAULT=YES,AUTOSELECT=YES,NAME="Default"
#EXT-X-MEDIA:URI="http://localhost:35835/itag/234/mediadata.m3u8",TYPE=AUDIO,GROUP-ID="234",DEFAULT=YES,AUTOSELECT=YES,NAME="Default"
#EXT-X-STREAM-INF:BANDWIDTH=1354423,CODECS="avc1.4D401F,mp4a.40.2",RESOLUTION=854x480,AUDIO="234",FRAME-RATE=30,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/231/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=318204,CODECS="avc1.4D4015,mp4a.40.5",RESOLUTION=426x240,AUDIO="233",FRAME-RATE=30,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/229/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=402807,CODECS="avc1.4D4015,mp4a.40.2",RESOLUTION=426x240,AUDIO="234",FRAME-RATE=30,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/229/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=811077,CODECS="avc1.4D401E,mp4a.40.2",RESOLUTION=640x360,AUDIO="234",FRAME-RATE=30,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/230/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=177519,CODECS="avc1.4D400C,mp4a.40.5",RESOLUTION=256x144,AUDIO="233",FRAME-RATE=30,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/269/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=3851098,CODECS="avc1.4D4020,mp4a.40.2",RESOLUTION=1280x720,AUDIO="234",FRAME-RATE=60,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/311/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=6324518,CODECS="avc1.64002A,mp4a.40.2",RESOLUTION=1920x1080,AUDIO="234",FRAME-RATE=60,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/312/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=95792,CODECS="vp09.00.10.08,mp4a.40.5",RESOLUTION=256x144,AUDIO="233",FRAME-RATE=15,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/602/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=170851,CODECS="vp09.00.11.08,mp4a.40.5",RESOLUTION=256x144,AUDIO="233",FRAME-RATE=30,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/603/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=292033,CODECS="vp09.00.20.08,mp4a.40.5",RESOLUTION=426x240,AUDIO="233",FRAME-RATE=30,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/604/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=376636,CODECS="vp09.00.20.08,mp4a.40.2",RESOLUTION=426x240,AUDIO="234",FRAME-RATE=30,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/604/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=716510,CODECS="vp09.00.21.08,mp4a.40.2",RESOLUTION=640x360,AUDIO="234",FRAME-RATE=30,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/605/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=1145989,CODECS="vp09.00.30.08,mp4a.40.2",RESOLUTION=854x480,AUDIO="234",FRAME-RATE=30,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/606/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=3217654,CODECS="vp09.00.40.08,mp4a.40.2",RESOLUTION=1280x720,AUDIO="234",FRAME-RATE=60,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/612/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=6078208,CODECS="vp09.00.41.08,mp4a.40.2",RESOLUTION=1920x1080,AUDIO="234",FRAME-RATE=60,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/617/mediadata.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=14086878,CODECS="vp09.00.50.08,mp4a.40.2",RESOLUTION=2560x1440,AUDIO="234",FRAME-RATE=60,VIDEO-RANGE=SDR,CLOSED-CAPTIONS=NONE
http://localhost:35835/itag/623/mediadata.m3u8


  


  And to give an example of how a EXT-STREAM-INF link content looks, here is a sample :

  


  #EXTM3U
#YT-EXT-CONDENSED-URL:BASE-URI="https://rr6---sn-gqn-h5qs.googlevideo.com/videoplayback/id/189d2f25f6103cad/itag/233/source/youtube/cpn/2TC6rJxXeKRmE8UD/expire/1696647973/ei/xXYgZczEE-idp-oPltGVuAI/ip/2a0c:5a84:f209:1800:b842:b4cf:48d7:ca1c/requiressl/yes/ratebypass/yes/goi/133/sgoap/clen%3D4352437%3Bdur%3D713.642%3Bgir%3Dyes%3Bitag%3D139%3Blmt%3D1677742885047413/hls_chunk_host/rr6---sn-gqn-h5qs.googlevideo.com/mh/M-/mm/31,29/mn/sn-gqn-h5qs,sn-h5qzen7y/ms/au,rdu/mv/m/mvi/6/pl/36/ctier/A/pfa/5/initcwndbps/1466250/hightc/yes/siu/1/vprv/1/playlist_type/DVR/txp/5532434/mt/1696626071/fvip/2/keepalive/yes/fexp/24007246/beids/24350018/sparams/expire,ei,ip,id,itag,source,requiressl,ratebypass,goi,sgoap,ctier,pfa,hightc,siu,vprv,playlist_type/sig/AGM4YrMwRQIhAIxbCFktH4mxamWq1_maS3YbKeNCpYaOd8JCh0fMaCblAiBFrvxzoCzIjaLpMkxvv6Aw0dSNpYDl_KI-P1aNw7McyQ%3D%3D/lsparams/hls_chunk_host,mh,mm,mn,ms,mv,mvi,pl,initcwndbps/lsig/AK1ks_kwRQIhAOKU632ETDnLoNcjq8c7oB8fd2bxioPtYANy3Bo7LKrvAiBfywDIDKfA4RY7c0CzqpRWOso0X0Gkbx6aLox0EG11KQ%3D%3D/playlist/index.m3u8",PARAMS="begin,len,goap,gosq",PREFIX="s/"
#EXT-X-VERSION:3
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-TARGETDURATION:7
#EXTINF:3.1,
https://rr6---sn-gqn-h5qs.googlevideo.com/videoplayback/id/189d2f25f6103cad/itag/233/source/youtube/cpn/2TC6rJxXeKRmE8UD/expire/1696647973/ei/xXYgZczEE-idp-oPltGVuAI/ip/2a0c:5a84:f209:1800:b842:b4cf:48d7:ca1c/requiressl/yes/ratebypass/yes/goi/133/sgoap/clen%3D4352437%3Bdur%3D713.642%3Bgir%3Dyes%3Bitag%3D139%3Blmt%3D1677742885047413/hls_chunk_host/rr6---sn-gqn-h5qs.googlevideo.com/mh/M-/mm/31,29/mn/sn-gqn-h5qs,sn-h5qzen7y/ms/au,rdu/mv/m/mvi/6/pl/36/ctier/A/pfa/5/initcwndbps/1466250/hightc/yes/siu/1/vprv/1/playlist_type/DVR/txp/5532434/mt/1696626071/fvip/2/keepalive/yes/fexp/24007246/beids/24350018/sparams/expire,ei,ip,id,itag,source,requiressl,ratebypass,goi,sgoap,ctier,pfa,hightc,siu,vprv,playlist_type/sig/AGM4YrMwRQIhAIxbCFktH4mxamWq1_maS3YbKeNCpYaOd8JCh0fMaCblAiBFrvxzoCzIjaLpMkxvv6Aw0dSNpYDl_KI-P1aNw7McyQ%3D%3D/lsparams/hls_chunk_host,mh,mm,mn,ms,mv,mvi,pl,initcwndbps/lsig/AK1ks_kwRQIhAOKU632ETDnLoNcjq8c7oB8fd2bxioPtYANy3Bo7LKrvAiBfywDIDKfA4RY7c0CzqpRWOso0X0Gkbx6aLox0EG11KQ%3D%3D/playlist/index.m3u8/s/0/3100/slices%3D0-62986/0
#EXTINF:4.266666,
https://rr6---sn-gqn-h5qs.googlevideo.com/videoplayback/id/189d2f25f6103cad/itag/233/source/youtube/cpn/2TC6rJxXeKRmE8UD/expire/1696647973/ei/xXYgZczEE-idp-oPltGVuAI/ip/2a0c:5a84:f209:1800:b842:b4cf:48d7:ca1c/requiressl/yes/ratebypass/yes/goi/133/sgoap/clen%3D4352437%3Bdur%3D713.642%3Bgir%3Dyes%3Bitag%3D139%3Blmt%3D1677742885047413/hls_chunk_host/rr6---sn-gqn-h5qs.googlevideo.com/mh/M-/mm/31,29/mn/sn-gqn-h5qs,sn-h5qzen7y/ms/au,rdu/mv/m/mvi/6/pl/36/ctier/A/pfa/5/initcwndbps/1466250/hightc/yes/siu/1/vprv/1/playlist_type/DVR/txp/5532434/mt/1696626071/fvip/2/keepalive/yes/fexp/24007246/beids/24350018/sparams/expire,ei,ip,id,itag,source,requiressl,ratebypass,goi,sgoap,ctier,pfa,hightc,siu,vprv,playlist_type/sig/AGM4YrMwRQIhAIxbCFktH4mxamWq1_maS3YbKeNCpYaOd8JCh0fMaCblAiBFrvxzoCzIjaLpMkxvv6Aw0dSNpYDl_KI-P1aNw7McyQ%3D%3D/lsparams/hls_chunk_host,mh,mm,mn,ms,mv,mvi,pl,initcwndbps/lsig/AK1ks_kwRQIhAOKU632ETDnLoNcjq8c7oB8fd2bxioPtYANy3Bo7LKrvAiBfywDIDKfA4RY7c0CzqpRWOso0X0Gkbx6aLox0EG11KQ%3D%3D/playlist/index.m3u8/s/3100/4267/slices%3D0-62986/1
h5qs.googlevideo.com/videoplayback/id/189d2f25f6103cad/itag/233/source/youtube/cpn/2TC6rJxXeKRmE8UD/expire/1696647973/ei/xXYgZczEE-idp-oPltGVuAI/ip/2a0c:5a84:f209:1800:b842:b4cf:48d7:ca1c/requiressl/yes/ratebypass/yes/goi/133/sgoap/clen%3D4352437%3Bdur%3D713.642%3Bgir%3Dyes%3Bitag%3D139%3Blmt%3D1677742885047413/hls_chunk_host/rr6---sn-gqn-h5qs.googlevideo.com/mh/M-/mm/31,29/mn/sn-gqn-h5qs,sn-h5qzen7y/ms/au,rdu/mv/m/mvi/6/pl/36/ctier/A/pfa/5/initcwndbps/1466250/hightc/yes/siu/1/vprv/1/playlist_type/DVR/txp/5532434/mt/1696626071/fvip/2/keepalive/yes/fexp/24007246/beids/24350018/sparams/expire,ei,ip,id,itag,source,requiressl,ratebypass,goi,sgoap,ctier,pfa,hightc,siu,vprv,playlist_type/sig/AGM4YrMwRQIhAIxbCFktH4mxamWq1_maS3YbKeNCpYaOd8JCh0fMaCblAiBFrvxzoCzIjaLpMkxvv6Aw0dSNpYDl_KI-P1aNw7McyQ%3D%3D/lsparams/hls_chunk_host,mh,mm,mn,ms,mv,mvi,pl,initcwndbps/lsig/AK1ks_kwRQIhAOKU632ETDnLoNcjq8c7oB8fd2bxioPtYANy3Bo7LKrvAiBfywDIDKfA4RY7c0CzqpRWOso0X0Gkbx6aLox0EG11KQ%3D%3D/playlist/index.m3u8/s/693833/5034/slices%3D0-640,4202012-4262932/148
#EXTINF:4.3,
https://rr6---sn-gqn-h5qs.googlevideo.com/videoplayback/id/189d2f25f6103cad/itag/233/source/youtube/cpn/2TC6rJxXeKRmE8UD/expire/1696647973/ei/xXYgZczEE-idp-oPltGVuAI/ip/2a0c:5a84:f209:1800:b842:b4cf:48d7:ca1c/requiressl/yes/ratebypass/yes/goi/133/sgoap/clen%3D4352437%3Bdur%3D713.642%3Bgir%3Dyes%3Bitag%3D139%3Blmt%3D1677742885047413/hls_chunk_host/rr6---sn-gqn-h5qs.googlevideo.com/mh/M-/mm/31,29/mn/sn-gqn-h5qs,sn-h5qzen7y/ms/au,rdu/mv/m/mvi/6/pl/36/ctier/A/pfa/5/initcwndbps/1466250/hightc/yes/siu/1/vprv/1/playlist_type/DVR/txp/5532434/mt/1696626071/fvip/2/keepalive/yes/fexp/24007246/beids/24350018/sparams/expire,ei,ip,id,itag,source,requiressl,ratebypass,goi,sgoap,ctier,pfa,hightc,siu,vprv,playlist_type/sig/AGM4YrMwRQIhAIxbCFktH4mxamWq1_maS3YbKeNCpYaOd8JCh0fMaCblAiBFrvxzoCzIjaLpMkxvv6Aw0dSNpYDl_KI-P1aNw7McyQ%3D%3D/lsparams/hls_chunk_host,mh,mm,mn,ms,mv,mvi,pl,initcwndbps/lsig/AK1ks_kwRQIhAOKU632ETDnLoNcjq8c7oB8fd2bxioPtYANy3Bo7LKrvAiBfywDIDKfA4RY7c0CzqpRWOso0X0Gkbx6aLox0EG11KQ%3D%3D/playlist/index.m3u8/s/698867/4300/slices%3D0-640,4202012-4323843/149
[.. a lot more parts ...]
#EXT-X-ENDLIST


  


  Note :

  


  

  • I tried already to parse master.m3u8 to filter the streams and produce a new master.m3u8 with just the streams that I want ( 1 of audio + 1 of video ). Timming improves a bit but it's still more than 15 seconds !

  


  • I've the feeling that avformat_open_input is reading/opening/parsing all parts into each EXT-X-STREAM-INF or something like that as otherwise this makes no sense. No idea on how to solve this.

  


  • I already tried with some options like http_multiple or http_seekable, without any change on results..

  


  


  Any ideas ?

  


• How to embed SCC closed caption file into a video file mov/mp4/mpg

  5 août 2015, par Santhosh S

  I am trying to embed a closed caption (SCC) file into a video file and hitting on some problems.

  Please suggest how to embed SCC closed caption file into a video file mov/mp4/mpg

  Does FFMPEG support closed captions - scc files as input ?

  Which open source tools can I use to do the above task ?

  Thanks

• FFMPEG MKV -> MP4 Batch Conversion

  15 juillet 2024, par blaziken386

  I'm trying to write a program that lets me convert a series of .mkv files with subtitle files into .mp4 files with the subs hardcoded.

  


  Right now, the script I use is

  


  ffmpeg -i input.mkv -vf subtitles=input.mkv output.mp4



  


  This is fine, but it means I can only convert them one at a time, and it's kind of a hassle because it means I have to fiddle with it every few minutes to set up the next one.

  


  I have another script I use for converting .flac files to .mp3 files, which is

  


  @ECHO OFF

FOR %%f IN (*.flac) DO (
echo Converting: %%f
ffmpeg -i "%%f" -ab 320k -map_metadata 0 "%%~nf.mp3"
)

echo Finished

PAUSE



  


  Running that converts every single .flac folder into an .mp3 equivalent, with the same filename and everything.

  


  I've tried to combine the above scripts into something like this :

  


  @ECHO OFF

FOR %%f IN (*.mkv) DO (
echo Converting: %%f
ffmpeg -i "%%f" -vf subtitles=%%f "%%~nf.mp4"
)

echo Finished

PAUSE


  


  but every time I do so, it returns errors like "invalid argument" or "unable to find a suitable output type", or "error initializing filters", or "2 frames left in the queue on closing" or something along those lines. I've swapped out subtitles=%%f for "subtitles-%%f" or subtitles="%%f.mkv" and so on and so forth, and none of those give me what I want either. Sometimes it creates Empty .mp4 file containers with nothing in them, sometimes it does nothing at all.

  


  I don't really understand what exactly is happening under the hood in that flac->mp3 code, because I grabbed it from a different stackoverflow post years ago. All I know is that trying to copy that code and repurpose it into something else doesn't work. Is this just an issue where I've fucked up the formatting of the code and not realized it, or is this a "ffmpeg can't actually do that because of a weird technical issue" thing ?

  


  I also tried the code listed here, when Stackoverflow listed that as a possible duplicate, but that gave me similar errors, and I don't really understand why !

  


  Also, if it's relevant, I'm running windows.