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  • ffmpeg : video to aligned audio (audio too short)

    16 octobre 2020, par mcb

    I want to extract an aligned audio stream from a video. The goal is to obtain an audio sequence that is precisely aligned with the video.

    


    Issue : The video and audio sequences are not aligned. The output audio duration is shorter than the video input.

    


    Script to reproduce :

    


    fn=TV-20200617-2242-4900.websm.h264
url=https://download.media.tagesschau.de/video/2020/0617/$fn.mp4
wget -nc $url

ffmpeg -y -i "$fn.mp4" -vsync 1 -async 1 -map 0:a "$fn.wav" -map 0:v "$fn.flv"

ffprobe -i $fn.mp4  # Duration: 00:01:51.68
ffprobe -i $fn.flv  # Duration: 00:01:51.68
ffprobe -i $fn.wav  # Duration: 00:01:49.61


    


    What I have tried (without success) :

    


      

    • Adding -async 1 as suggested in this answer.

      • 


    • Adding -acodec copy and exporting the video at the same time (link).

      • 


    • Opening the mp4 in Audacity. The duration there is 00:01:49.61.

      • 


    • Opening the mp4 in VLC. Duration : 00:01:51.68.

      • 


    • Explicitly setting the framerate.

      • 


    • Other video files.

      • 


    


    ffmpeg version 4.2.4-1ubuntu0.1

    


    I would appreciate any hint on how to make this work. Thank you.

    


  • Compiled FFmpeg not accepting -c:v and -c:a

    13 mars 2020, par King Horse

    I compiled FFmpeg with libsrt, with the online compile guide. https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu & how to compile ffmpeg with enabling libsrt

    It seems to compile correctly.

    ffmpeg version N-96575-g843c24a Copyright (c) 2000-2020 the FFmpeg developers
    
built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
    
configuration: --prefix=/home/ubuntu/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ubuntu/ffmpeg_build/include --extra-ldflags=-L/home/ubuntu/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/ubuntu/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libsrt --enable-nonfree
    
libavutil      56. 38.100 / 56. 38.100
    
libavcodec     58. 67.100 / 58. 67.100
    
libavformat    58. 37.100 / 58. 37.100
    
libavdevice    58.  9.103 / 58.  9.103
    
libavfilter     7. 72.100 /  7. 72.100
    
libswscale      5.  6.100 /  5.  6.100
    
libswresample   3.  6.100 /  3.  6.100
    
libpostproc    55.  6.100 / 55.  6.100

    But when running this command to convert a incoming SRT stream to HLS, it doesn’t know the -c:a command. When switching the order, it runs that it doesn’t know about the -c:v command.

    ffmpeg -re -i srt://0.0.0.0:25000?pkt_size=1316&mode=listener -c:a copy -c:v copy -strict -f hls -hls_time 4 -hls_playlist_type event stream.m3u8
    ~$ ffmpeg -re -i srt://0.0.0.0:25000?pkt_size=1316&mode=listener -c:a copy -c:v copy -strict -f hls -hls_time 4 -hls_playlist_type event stream.m3u8
    
[2] 9930
    
ffmpeg version N-96575-g843c24a Copyright (c) 2000-2020 the FFmpeg developers
    
  built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
    
  configuration: --prefix=/home/ubuntu/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ubuntu/ffmpeg_build/include --extra-ldflags=-L/home/ubuntu/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/ubuntu/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libsrt --enable-nonfree
    
  libavutil      56. 38.100 / 56. 38.100
    
  libavcodec     58. 67.100 / 58. 67.100
    
  libavformat    58. 37.100 / 58. 37.100
    
  libavdevice    58.  9.103 / 58.  9.103
    
  libavfilter     7. 72.100 /  7. 72.100
    
  libswscale      5.  6.100 /  5.  6.100
    
  libswresample   3.  6.100 /  3.  6.100
    
  libpostproc    55.  6.100 / 55.  6.100
    
-c:a: command not found
    

    
[2]+  Stopped                 ffmpeg -re -i srt://0.0.0.0:25000?pkt_size=1316

    I have searched the issue, but I could not find anything similar.
    Does someone know what I have missed in the setup ?

    Everything is manually compiled through the guide, this was the final command I run to compile FFmpeg :

    cd ~/ffmpeg_sources && \
    
wget -O ffmpeg-snapshot.tar.bz2 https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2 && \
    
tar xjvf ffmpeg-snapshot.tar.bz2 && \
    
cd ffmpeg && \
    
PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
    
  --prefix="$HOME/ffmpeg_build" \
    
  --pkg-config-flags="--static" \
    
  --extra-cflags="-I$HOME/ffmpeg_build/include" \
    
  --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
    
  --extra-libs="-lpthread -lm" \
    
  --bindir="$HOME/bin" \
    
  --enable-gpl \
    
  --enable-libaom \
    
  --enable-libass \
    
  --enable-libfdk-aac \
    
  --enable-libfreetype \
    
  --enable-libmp3lame \
    
  --enable-libopus \
    
  --enable-libvorbis \
    
  --enable-libvpx \
    
  --enable-libx264 \
    
  --enable-libx265 \
    
  --enable-libsrt \
    
  --enable-nonfree && \
    
PATH="$HOME/bin:$PATH" make && \
    
make install && \
    
hash -r

  • Compilied Ffmpeg not accepting -c:v and -c:a

    2 février 2020, par King Horse

    I complied FFMPEG with libsrt, with the online compile guide. https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu & how to compile ffmpeg with enabling libsrt

    It seems to compile correctly.

    ffmpeg version N-96575-g843c24a Copyright (c) 2000-2020 the FFmpeg developers
    
built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
    
configuration: --prefix=/home/ubuntu/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ubuntu/ffmpeg_build/include --extra-ldflags=-L/home/ubuntu/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/ubuntu/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libsrt --enable-nonfree
    
libavutil      56. 38.100 / 56. 38.100
    
libavcodec     58. 67.100 / 58. 67.100
    
libavformat    58. 37.100 / 58. 37.100
    
libavdevice    58.  9.103 / 58.  9.103
    
libavfilter     7. 72.100 /  7. 72.100
    
libswscale      5.  6.100 /  5.  6.100
    
libswresample   3.  6.100 /  3.  6.100
    
libpostproc    55.  6.100 / 55.  6.100

    But when running this command to convert a incoming srt stream to HLS, it doesn’t know the -c:a command. When switching the order, it runs that it doesn’t know about the -c:v command.

    ffmpeg -re -i srt://0.0.0.0:25000?pkt_size=1316&mode=listener -c:a copy -c:v copy -strict -f hls -hls_time 4 -hls_playlist_type event stream.m3u8
    ~$ ffmpeg -re -i srt://0.0.0.0:25000?pkt_size=1316&mode=listener -c:a copy -c:v copy -strict -f hls -hls_time 4 -hls_playlist_type event stream.m3u8
    
[2] 9930
    
ffmpeg version N-96575-g843c24a Copyright (c) 2000-2020 the FFmpeg developers
    
  built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
    
  configuration: --prefix=/home/ubuntu/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ubuntu/ffmpeg_build/include --extra-ldflags=-L/home/ubuntu/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/ubuntu/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libsrt --enable-nonfree
    
  libavutil      56. 38.100 / 56. 38.100
    
  libavcodec     58. 67.100 / 58. 67.100
    
  libavformat    58. 37.100 / 58. 37.100
    
  libavdevice    58.  9.103 / 58.  9.103
    
  libavfilter     7. 72.100 /  7. 72.100
    
  libswscale      5.  6.100 /  5.  6.100
    
  libswresample   3.  6.100 /  3.  6.100
    
  libpostproc    55.  6.100 / 55.  6.100
    
-c:a: command not found
    

    
[2]+  Stopped                 ffmpeg -re -i srt://0.0.0.0:25000?pkt_size=1316

    I have searched the issue, but I could not find anything similar.
    Does someone what I have missed in the setup ?

    Everything is manual complied through the guide, this was the final command I run to compile FFMPEG :

    cd ~/ffmpeg_sources && \
    
wget -O ffmpeg-snapshot.tar.bz2 https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2 && \
    
tar xjvf ffmpeg-snapshot.tar.bz2 && \
    
cd ffmpeg && \
    
PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
    
  --prefix="$HOME/ffmpeg_build" \
    
  --pkg-config-flags="--static" \
    
  --extra-cflags="-I$HOME/ffmpeg_build/include" \
    
  --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
    
  --extra-libs="-lpthread -lm" \
    
  --bindir="$HOME/bin" \
    
  --enable-gpl \
    
  --enable-libaom \
    
  --enable-libass \
    
  --enable-libfdk-aac \
    
  --enable-libfreetype \
    
  --enable-libmp3lame \
    
  --enable-libopus \
    
  --enable-libvorbis \
    
  --enable-libvpx \
    
  --enable-libx264 \
    
  --enable-libx265 \
    
  --enable-libsrt \
    
  --enable-nonfree && \
    
PATH="$HOME/bin:$PATH" make && \
    
make install && \
    
hash -r

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