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• Mapping streams by language in FFmpeg

  8 décembre 2016, par ffmpeg123

  I have lots of files with multiple audio and subtitle languages, however the track numbers aren’t consistent (the English audio stream isn’t always the first) so using a command such as :

  ffmpeg -i "input.mkv" -map 0 -map -0:a:1 -c:v copy -c:a copy "output.mkv"

  doesn’t yield expected results. After searching around I discovered it was possible to map streams based on language with this command :

  ffmpeg -i "input.mkv" -map 0 -map -0:m:language:eng -c:v copy -c:a copy "output.mkv"

  However -map -0:m:language:eng will remove all tracks with the English language flag. To keep the subtitle tracks you can use -map 0:s this is a good solution however, I want to know if it’s possible to only map audio streams based on language.

• How to extract track 2 left channel using ffmpeg ?

  1er mai 2019, par flash

  I am working on a mp4 file in which I want to extract Track 2 left channel using ffmpeg.

  

  I tried with the following command on terminal but it seems to extract Track 1 - [English] :

  ffmpeg -i 36017P.mp4 filename.mp3

  Problem Statement :

  I am wondering what changes I need to make in the ffmpeg command above so that it extract Track 2 -[English] from mp4 file.

• Ffmpeg and ffprobe not showing subtitles stream in m3u8 file

  3 juin 2021, par DanielVip3

  I'm trying to get an mp4 video from a m3u8 playlist file (in simple HLS), with audio, video and subtitles.

  


  I've managed to extract the video and audio stream because they are relatively easy : the input m3u8, according to ffprobe, contains 3 different programs, and the third program (called Program 2) is the one I need, because it contains both the highest quality video and the English highest quality audio.

  


  So, what I really am doing is

  


  ffmpeg -i "blahblah.m3u8" -c copy -map 0:p:2:v:0 -map 0:p:2:a:m:language:eng -map 0:s:0 "output.mp4"


  


  Which means : select the first video stream for the third (index 2) program and the English language audio stream from the same third (index 2) program.

  


  My problem is : I can't seem to find the two subtitles streams.
The m3u8 has two subtitles : English and Spanish, as you can see in the m3u8 itself

  


  #EXTM3U
# Created with Bento4 mp4-hls.py version 1.2.0r637

#EXT-X-VERSION:4

# Subtitles
#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subtitles",NAME="English",LANGUAGE="en",URI="subtitles/en/subtitles.m3u8"
#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subtitles",NAME="Español",LANGUAGE="es",URI="subtitles/es/subtitles.m3u8"

# Audio
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_aac",NAME="Français",LANGUAGE="fra",AUTOSELECT=YES,DEFAULT=YES,URI="audio/aac/fra/stream.m3u8"
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_aac",NAME="English",LANGUAGE="eng",AUTOSELECT=YES,URI="audio/aac/eng/stream.m3u8"

# Media Playlists
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=2198120,BANDWIDTH=2416640,CODECS="avc1.4D401F,mp4a.40.2",RESOLUTION=1280x720,AUDIO="audio_aac",SUBTITLES="subtitles"
media-1/stream.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=1001663,BANDWIDTH=1102896,CODECS="avc1.42C01E,mp4a.40.2",RESOLUTION=640x360,AUDIO="audio_aac",SUBTITLES="subtitles"
media-2/stream.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=4007581,BANDWIDTH=4391894,CODECS="avc1.4D4029,mp4a.40.2",RESOLUTION=1920x1080,AUDIO="audio_aac",SUBTITLES="subtitles"
media-3/stream.m3u8


  


  I thought it was easy : I added a -map 0:s:0 to get the first subtitles, but ffmpeg told me that there's no stream named like that.

  


  Then I ran ffprobe, which tells me there are no subtitles streams for him :

  


  ffprobe "blahblah.m3u8" -show_streams -select_streams s


  


  You can find here all the streams which the ffprobe command shows. There are lots of video and audio streams, but there are no subtitles streams.

  


  Why don't ffmpeg and ffprobe find the subtitles streams ? Is it because they are split in a different m3u8 playlist file ?