Recherche avancée

Sur d’autres sites (13043)

• 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 ?

  


• ffmpeg : Set the language of an audio stream without touching other metadata

  7 octobre 2020, par amirvf

  I have a MP4 file with an audio stream set to English. I want to change the language of audio stream to French.
I use the following command :

  


  ffmpeg -i input.mp4 -map 0 -c: copy -metadata:s:v language=und -metadata:s:a:0 language=fre output.mp4


  


  The language of audio stream changes to French without any issues, however, the "Title" of language is lost.

  


  Initially the audio stream was like this :
  
Language : English
  
Title : AC3 5.1 Channels

  


  After changing the language to French it is like this :
  
Language : French
  
Title : empty

  


  How should I modify the command so it does not touch the other attributes such as "Title" ?

  


  Thanks