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• youtube_dl error ffprobe and ffmpeg not found

  10 septembre 2022, par RaphaelKursawe

  I've been using youtube_dl for a while now without any problems.
Since maybe around a week I am always getting the following error when trying to download something and don't know how to fix it :

  


  


  ERROR : ffprobe/avprobe and ffmpeg/avconv not found. Please install
one.

  


  


  I am using it in a virtual python 3.8.10 environment with youtube_dl version 2021.12.17, ffmpeg version 1.4 and ffprobe version 0.5 displayed with "pip freeze" command.
The os is ubuntu server 20.04.5 LTS.

  


  I already tried installing ffmpeg in multiple different ways (pip, apt install) and installing it on different "layers" (virtual env, normal user, root user) but nothing seemed to help.

  


  For any tips / suggestions that might help I'd be really glad.

  


• Lost video when converting from MKV to MP4 with FFMPEG

  25 décembre 2022, par Francesco Virga

  I'm trying to come up with a robust script to handle all MKV -> MP4 video conversions.

  


  The classic example I've found is ffmpeg -i input.mkv -codec copy output.mp4. This works for most videos, but I find that the video stream gets lost for certain videos. Using -map 0 doesn't help, the examples I'm using only have one video stream and one audio stream.

  


  If I only copy the audio codec, it seems to work fine, but takes much longer since video is re-encoded. For this I'm use ffmpeg -i input.mkv -c:a copy output.mp4. I'm fine to use this for certain videos, but am not sure how to determine whether video re-encoding is needed or not (since I want to avoid it when possible).

  


  Here's the output I get when I run the first command and lose video :

  


  % ffmpeg -i input.mkv -codec copy output.mp4

ffmpeg version N-103075-g4c694093be-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  libavutil      57.  2.100 / 57.  2.100
  libavcodec     59.  3.102 / 59.  3.102
  libavformat    59.  4.101 / 59.  4.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  1.103 /  8.  1.103
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
Input #0, matroska,webm, from 'input.mkv':
  Metadata:
    CREATION_TIME   :
    ENCODER         : Lavf55.12.0
  Duration: 00:59:15.97, start: 0.062000, bitrate: 1892 kb/s
  Stream #0:0: Video: hevc (Main), yuv420p(tv, bt709), 1912x1072 [SAR 1:1 DAR 239:134], 23.98 fps, 23.98 tbr, 1k tbn (default)
  Stream #0:1(eng): Audio: aac (LC), 48000 Hz, 5.1, fltp (default)
    Metadata:
      title           : Surround
      LANGUAGE        : eng
  Stream #0:2(eng): Subtitle: ass (default)
  Stream #0:3(eng): Subtitle: ass
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf59.4.101
  Stream #0:0: Video: hevc (Main) (hev1 / 0x31766568), yuv420p(tv, bt709), 1912x1072 [SAR 1:1 DAR 239:134], q=2-31, 23.98 fps, 23.98 tbr, 16k tbn (default)
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp (default)
    Metadata:
      title           : Surround
      LANGUAGE        : eng
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=32634 fps=0.0 q=-1.0 size=  295424kB time=00:22:41.04 bitrate=1778.1kbits/s speed=2.72e+03x frame=63776 fps=63775 q=-1.0 size=  611840kB time=00:44:19.94 bitrate=1884.3kbits/s speed=2.66e+03frame=85256 fps=62686 q=-1.0 Lsize=  822207kB time=00:59:15.83 bitrate=1894.2kbits/s speed=2.61e+03x
video:736136kB audio:83404kB subtitle:0kB other streams:0kB global headers:1kB muxing overhead: 0.325361%


  


• How to convert AAC/MP4A to MP3 using FFMPEG in full length ? Audio file gets cut off after 1 second

  6 novembre 2022, par Avatar

  I have recorded an audio file with MediaRecorder on iPhone.

  


  As ffmpeg command I am using :

  


  ffmpeg -i 18380889311644327118 -ar 44100 -ac 2 -b:a 128k -c:a libmp3lame -q:a 0 18380889311644327118.mp3


  


  -i specifies the input file
-vn disables all video-streams from the input
-ar audio sampling frequency
-ac number of audio channels
-b:a bit rate
-c:a libmp3lame - codec of target file
-q:a quality set audio quality (codec-specific) (lower is better), see https://superuser.com/a/1515841

-sn disables all subtitle-streams from the input
-dn disables all data-streams from the input


  


  The console output looks like this :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '18380889311644327118':
  Metadata:
    major_brand     : iso5
    minor_version   : 1
    compatible_brands: isomiso5hlsf
    creation_time   : 2021-12-08T15:44:06.000000Z
  Duration: 00:00:01.00, start: 0.000000, bitrate: 2258 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 2234 kb/s (default)
    Metadata:
      creation_time   : 2021-12-08T15:44:06.000000Z
      handler_name    : Core Media Audio
Stream mapping:
  Stream #0:0 -> #0:0 (aac (native) -> mp3 (libmp3lame))

Output #0, mp3, to '18380889311644327118.mp3':
  Metadata:
    major_brand     : iso5
    minor_version   : 1
    compatible_brands: isomiso5hlsf
    TSSE            : Lavf58.29.100
    Stream #0:0(und): Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2021-12-08T15:44:06.000000Z
      handler_name    : Core Media Audio
      encoder         : Lavc58.54.100 libmp3lame
size=      17kB time=00:00:01.01 bitrate= 135.5kbits/s speed=37.2x
video:0kB audio:16kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.343701%


  


  As you can see, the duration is 01.00 second. And this happens with all recorded files.

  


  How to convert the entire file (which is 12 seconds long) to its full length ?

  

  

  


  Note : It seems that the recorded file does not have a length specified. Under Windows I renamed the file, adding an extension ".m4a" and opened the file properties :

  


  

  


  The length attribute is empty.