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• Laravel FFMpeg - FFMpeg cannot edit existing files in-place

  28 septembre 2020, par wlaskovic

  After I wanted to upload a video in the queue was returned a failed job.

  


   [2020-09-25 13:24:25][125] Processing: App\Jobs\ConvertVideoForStreaming <br /> [2020-09-25 13:24:26][125] Failed:     App\Jobs\ConvertVideoForStreaming&#xA;

  


  So I've took from the DB failed_jobs table the response and run the following :

  


    C:\ffmpeg\bin\ffmpeg.exe -y -i "C:\wamp64\www\laravel-stream\storage\app/public\WF3UL8fJTSE7BMxa.mp4" -threads 12 -vcodec libx264 -acodec libmp3lame -b:v 500k -refs 6 -coder 1 -sc_threshold 40 -flags +loop -me_range 16 -subq 7 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 -trellis 1 -b:a 128k -vf "[in]scale=720:360 [out]" -pass 1 -passlogfile "C:\Users\wlask\AppData\Local\Temp\ffmpeg-passes5f6dd36a4519fd1fev/pass-5f6dd36a452c9" "C:\wamp64\www\laravel-stream\storage\app/public\WF3UL8fJTSE7BMxa.mp4"


  


  Which returned the following :

  


  ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.1 (GCC) 20200726
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\wamp64\www\laravel-stream\storage\app/public\WF3UL8fJTSE7BMxa.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41isomavc1
    creation_time   : 2015-08-07T09:13:02.000000Z
  Duration: 00:00:30.53, start: 0.000000, bitrate: 411 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 480x270 [SAR 1:1 DAR 16:9], 301 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:02.000000Z
      handler_name    : L-SMASH Video Handler
      encoder         : AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 112 kb/s (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:02.000000Z
      handler_name    : L-SMASH Audio Handler


  


  


  Output C :\wamp64\www\laravel-stream\storage\app/public\WF3UL8fJTSE7BMxa.mp4 same as Input #0 - exiting

  


  FFmpeg cannot edit existing files in-place.

  


  


  This was returned after i've run the command from DB failed jobs table return.

  


  How should I solve this ?

  


• FFMPEG is doubling audio length when extracting from video

  23 mars 2015, par Samuel Stiles

  I’ve got a video file, video.mp4. It is 18 minutes 23 seconds in duration. I am looking to extract the audio only from this video, and create an MP3 of the highest possible quality from the audio in the video.

  Some googlefu lead me to this command : ffmpeg -i video.mp4 audio.mp3

  The problem is that, this command doubles the length of the audio that’s outputted (duration is 36 minutes 46 seconds). It loops the audio track once, so the output contains the entire 18 minutes 23 seconds of audio, then immediately starts the 18 minutes and 23 seconds of audio over again.

  Some more googlefu lead me to this flag : -write_xing 0 from this SO question, but even with that flag it still loops the audio.

  EDIT : Additional googlefu and me seeming to think it has something to do with 2 audio channels (and perhaps looping channel 2 immediately after channel 1, rather than merging the two) lead me to this flag : -ac 1 to force it to merge stereo -> mono. This did not work also, and it still outputs a 38 minute 46 seconds MP3 file.

  How can I extract (to MP3) the audio from a video file, without doubling the duration ?

• Limit cpu limit of process in a loop

  6 octobre 2023, par chew socks

  I am trying to execute ffmpeg in a loop over multiple files. I only want one instance to run at a time, and to only use 50% of the cpu. I've been trying cpulimit but it isn't playing nice with the loop.

  



  for i in {1..9}; do cpulimit -l 50 -- ffmpeg <all the="the" options="options">; done&#xA;</all>

  



  This spawns all nine jobs at once, and they are all owned by init so I have to open htop to kill them.

  



  for i in {1..9}; do ffmpeg <all the="the" options="options"> &amp; cpulimit -p $! -l 50; done&#xA;</all>

  



  This hangs, ctrl+c continues to the next loop iteration. These instances can only be killed by SIGKILL.