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• What version of ffmpeg does libvlc use ?

  7 janvier 2016, par user3846684

  I am writing an application on linux (debian) that uses both libvlc and ffmpeg.
  Both run fine separately, but the moment I try to compile both functionalities into my app, libvlc stops working (complains about not finding the codecs).

  I have been able to isolate the problem, basically libvlc runs fine until I compile the first line of ffmpeg code (av_register_all), at which point the linker brings in my own ffmpeg compiled lib, and the moment I do that, it stops playing the file. Obviously I have 2 conflicting ffmpeg libs on my system, the one libvlc is using, and the newer one I built myself to write ffmpeg code.

  My question is, how do I make libvlc work with the newer library ? Considering there were functions deprecated in the newer ffmpeg code, would that involve recompiling libvlc ? Is the libvlc code up to date with the newest ffmpeg library(new function signatures) ?

  Any help is appreciated !

• ffmpeg concat "demuxer" doesn't concatenate videos with the same codec correctly [duplicate]

  1er janvier 2021, par Halim Amran

  the clips add up to about 27 secs but the output file is about 24 min long. the first clip runs normally but as soon as the second starts it just sorta freezes (it runs on an extremely low frame rate). the 3rd one just runs extremely fast for some reason.

  


  files.txt :

  


  file './tmp/clip_0_0.mp4' 
file './tmp/clip_0_1.mp4' 
file './tmp/clip_0_2.mp4' 


  


  this is the command I'm using

  


  ffmpeg -f concat -safe 0 -i files.txt -c copy -an ./ready/clip_0r.mp4

  


  files

  


  per request of llogan ; showing the output of ffmpeg -i ./tmp/clip_0_0.mp4 -i ./tmp/clip_0_1.mp4 -i ./tmp/clip_0_2.mp4

  


  ffmpeg version 2021-01-01-git-63505fc60a-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 62.100 / 56. 62.100
  libavcodec     58.115.102 / 58.115.102
  libavformat    58. 65.100 / 58. 65.100
  libavdevice    58. 11.103 / 58. 11.103
  libavfilter     7. 94.100 /  7. 94.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './tmp/clip_0_0.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.65.100
  Duration: 00:00:10.42, start: 0.000000, bitrate: 5670 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, unknown/smpte170m/unknown), 1920x1080, 5670 kb/s, 59.99 fps, 60 tbr, 15360 tbn, 2k tbc (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from './tmp/clip_0_1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.31.102
  Duration: 00:00:10.36, start: 0.000000, bitrate: 1256 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], 1249 kb/s, 60.03 fps, 60.03 tbr, 805837.00 tbn, 120.07 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from './tmp/clip_0_2.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.65.100
  Duration: 00:00:06.83, start: 0.094987, bitrate: 5680 kb/s
    Stream #2:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, unknown/smpte170m/unknown), 1920x1080, 5672 kb/s, 60.01 fps, 60 tbr, 15360 tbn, 2k tbc (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
At least one output file must be specified


  


• Bash script for re-encode file if re-encoded file does not already exist for all in directory

  25 octobre 2022, par steve

  I have a bash script that takes 1 argument (a file) and runs an ffmpeg command to create a duplicate of the file encoded with a different codec.

  


  #!/bin/bash

ffmpeg -i "$1" -vn -acodec aac "$(basename "${1/.wav}").aac"


  


  I just want to modify this bash script so instead of taking an argument, it instead just checks for all files in the directory to see if the re-encoded file already exists, and if it does not, creates it. Does anyone know how to do this ?

  


  Thanks for your help

  


  EDIT : the solution below is working with slight modification :

  


  #!/bin/bash

for file in ./*.wav; do
    [ -e "$file" ] || continue # check if any file exists
    if [[ ! -f "${file}.aac" ]]; then
       ffmpeg -i "${file}" -vn -acodec aac "$(basename "${file}").aac"
    fi;
done;