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• how to make this ffmpeg concat better or fast ?

  21 mai 2021, par JohnTerry

  I am using this command to concat video urls and producing output video as .webm but it is very slow how do i make this faster ?

  


  command is -

  


      cmd = "ffmpeg -safe 0 -f concat -protocol_whitelist file,http,https,tcp,tls,crypto -segment_time_metadata 1 -i {} -vf select=concatdec_select,scale={}:{} -af aselect=concatdec_select,aresample=async=1 -c:v libvpx-vp9 -crf 30 -b:v 0 -b:a 128k -c:a libopus {}".format(text_file_path, width, height, output_video_path)


  


  I created a video of resolution 640:360 and full log for the video is posted below-

  


  ffmpeg version n4.3.1 Copyright (c) 2000-2020 the FFmpeg developers


built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix= --prefix=/usr --disable-debug --disable-doc --disable-static --enable-cuda --enable-cuda-sdk --enable-cuvid --enable-libdrm --enable-ffplay --enable-gnutls --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libmp3lame --enable-libnpp --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopus --enable-libpulse --enable-sdl2 --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxvid --enable-nonfree --enable-nvenc --enable-omx --enable-openal --enable-opencl --enable-runtime-cpudetect --enable-shared --enable-vaapi --enable-vdpau --enable-version3 --enable-xlib
  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
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55d8eeec1580] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from '/home/xyz/Desktop/a/files4.txt':
  Duration: N/A, start: 0.000000, bitrate: 2073 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s
    Metadata:
      creation_time   : 2010-05-17T15:28:46.000000Z
      handler_name    : (C) 2007 Google Inc. v08.13.2007.
    Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1947 kb/s, 24 fps, 24 tbr, 24k tbn, 48 tbc
    Metadata:
      creation_time   : 2010-05-17T15:28:46.000000Z
      handler_name    : (C) 2007 Google Inc. v08.13.2007.
File '/home/aman/Desktop/a/out5.webm' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:1 -> #0:0 (h264 (native) -> vp9 (libvpx-vp9))
  Stream #0:0 -> #0:1 (aac (native) -> opus (libopus))
Press [q] to stop, [?] for help
[libopus @ 0x55d8ef23ab00] No bit rate set. Defaulting to 96000 bps.
[libvpx-vp9 @ 0x55d8eeecca80] v1.7.0
[libvpx-vp9 @ 0x55d8eeecca80] Neither bitrate nor constrained quality specified, using default CRF of 32
Output #0, webm, to '/home/aman/Desktop/a/out5.webm':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0(und): Video: vp9 (libvpx-vp9), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 24 fps, 1k tbn, 24 tbc
    Metadata:
      creation_time   : 2010-05-17T15:28:46.000000Z
      handler_name    : (C) 2007 Google Inc. v08.13.2007.
      encoder         : Lavc58.91.100 libvpx-vp9
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1(und): Audio: opus (libopus), 48000 Hz, stereo, flt, 96 kb/s
    Metadata:
      creation_time   : 2010-05-17T15:28:46.000000Z
      handler_name    : (C) 2007 Google Inc. v08.13.2007.
      encoder         : Lavc58.91.100 libopus
frame=15691 fps= 45 q=0.0 Lsize=   52833kB time=00:10:53.81 bitrate= 662.0kbits/s speed=1.87x    
video:44974kB audio:7523kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.640121%

Process finished with exit code 0


  


• Use FFmpeg in Visual Studio

  12 février, par box

  I'm trying to use FFmpeg in a C++ project in Visual Studio 2010. I want to include the libraries as statically linked files. Simple programs like libavcodec/api-example.c compile without error and no linker error appears in the error view when starting them. However, a message box shows up after starting the application, saying that avutil-51.dll is missing. Do you have any hints on how to fix that ?

  



  I used the latest dev build from http://ffmpeg.zeranoe.com/builds/. Then I specified include as additional include directory, avcodec.lib ;avfilter.lib ;avformat.lib ;avutil.lib as additional dependencies and lib as additional library directory.

  


• ffmpeg - Convert files but keep Same Date Modification as Original ?

  9 septembre 2021, par user5894146

  So I want to start with that ffmpeg and powershell isn't really my strength but I have been using the following powershell command to convert every .flac file in a certain directory to a 320K file.

  


  dir *.flac | foreach {ffmpeg -i $_.FullName -c:v copy  -b:a 320k  $_.FullName.Replace('flac', 'mp3')}


  


  This works exactly how I want to without any album art being transcoded but I want to incorporate a way so that the new .mp3 files that are created have the SAME DATE MODIFICATION value of the .flac files. Is something like this even possible ?

  


  audio_ex.flac = Date Modification: 1/1/2010
audio_ex.mp3 = Date Modification: 9/8/2021


  


  should be instead

  


  audio_ex.flac = Date Modification: 1/1/2010
audio_ex.mp3 = Date Modification: 1/1/2010


  


  I have a folder of 6K files and want each original date modified to match the newly created files so if I can do the above command and also have the date mod time match within one execution, that would be ideal.

  


  I thought of manually changing each files mod time using 3rd party tools but it will be too time consuming.