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• ffmpeg : mute first 2 seconds in all audio streams

  10 avril 2015, par Tony

  Looking to edit a blip out of the beginning of a video/audio file :

  • How can I use ffmpeg to only edit the first two seconds of the clip so that there’s no longer that blip in the audio ?

  • How do I ensure that all 7 audio tracks are affected by the audio filter ?

  • How do I ensure that all 7 are also present in my output file in the same input specs ?

  Complete output :

  ffmpeg -i ~/Downloads/in.mov  -vcodec copy -acodec pcm_s24le -q:a 0 -af "volume=enable='between(t,0,3)':volume=0"  ~/Downloads/out2.mov
  
  ffmpeg version 2.6.1 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.6.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Guessed Channel Layout for  Input Stream #0.2 : mono
  
  Guessed Channel Layout for  Input Stream #0.3 : mono
  
  Guessed Channel Layout for  Input Stream #0.4 : mono
  
  Guessed Channel Layout for  Input Stream #0.5 : mono
  
  Guessed Channel Layout for  Input Stream #0.6 : mono
  
  Guessed Channel Layout for  Input Stream #0.7 : stereo
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '~/Downloads/in.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2014-01-16 18:02:27
  
    Duration: 00:00:06.44, start: 0.000000, bitrate: 119128 kb/s
  
      Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709), 1920x1080, 109843 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 2997 tbn, 2997 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-01-16 18:02:27
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : Apple ProRes 422 (HQ)
  
        timecode        : 01:00:00;00
  
      Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-01-16 18:02:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:2(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-01-16 18:02:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:3(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-01-16 18:02:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:4(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-01-16 18:02:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:5(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-01-16 18:02:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:6(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-01-16 18:02:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:7(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 2 channels, s32 (24 bit), 2304 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-01-16 18:02:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:8(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-01-16 18:02:28
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 01:00:00;00
  
  File '~/Downloads/out2.mov' already exists. Overwrite ? [y/N] y
  
  Output #0, mov, to '~/Downloads/out2.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      encoder         : Lavf56.25.101
  
      Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 109843 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 2997 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-01-16 18:02:27
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : Apple ProRes 422 (HQ)
  
        timecode        : 01:00:00;00
  
      Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-01-16 18:02:27
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : Lavc56.26.100 pcm_s24le
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:7 -> #0:1 (pcm_s24le (native) -> pcm_s24le (native))
  
  Press [q] to stop, [?] for help
  
  frame=  193 fps=109 q=-1.0 Lsize=   88166kB time=00:00:06.43 bitrate=112155.7kbits/s    
  
  video:86349kB audio:1811kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.006946%

• Add multiple metadata in video using ffmpeg command

  19 janvier 2019, par Raghbendra Nayak

  Command to add single metadata working fine

  ffmpeg -i '/var/www/html/public/uploads/wp-video/akka.mov' -metadata kKeyContentIdentifier='com.apple.quicktime.content.identifier' '/var/www/html/public/uploads/video-thumb/updated-akka.mov'

  Add multiple metadata command, I pass the multiple metadata tag like below

  ffmpeg -i '/var/www/html/public/uploads/wp-video/akka.mov' -metadata kKeyContentIdentifier='com.apple.quicktime.content.identifier' -metadata kKeyStillImageTime = 'com.apple.quicktime.still-image-time' -metadata kKeySpaceQuickTimeMetadata = 'mdta' '/var/www/html/public/uploads/video-thumb/updated-akka.mov'

  Its not working, is there any other way to pass multiple metadata in command ?

• How Much H.264 In Each Encoder ?

  8 septembre 2010, par Multimedia Mike — General

  Thanks to my recent experiments with code coverage tools, I have a powerful new — admittedly somewhat specious — method of comparing programs. For example, I am certain that I have read on more than one occasion that Apple’s H.264 encoder sucks compared to x264 due, at least in part, to the Apple encoder’s alleged inability to exercise all of H.264′s features. I wonder how to test that claim ?

  Experiment
  Use code coverage tools to determine which H.264 encoder uses the most features.

  Assumptions

  • Movie trailers hosted by Apple will all be encoded with the same settings using Apple’s encoder.
  • Similarly, Yahoo’s movie trailers will be encoded with consistent settings using an unknown encoder.
  • Encoding a video using FFmpeg’s libx264-slow setting will necessarily throw a bunch of H.264′s features into the mix (I really don’t think this assumption holds much water, but I also don’t know what “standard” x264 settings are).

  Methodology

  • Grab a random Apple-hosted 1080p movie trailer and random Yahoo-hosted 1080p movie trailer from Dave’s Trailer Page.
  • Use libx264/FFmpeg with the ‘slow’ preset to encode Big Buck Bunny 1080p from raw PNG files.
  • Build FFmpeg with code coverage enabled.
  • Decode each file to raw YUV, ignore audio decoding, generate code coverage statistics using gcovr, reset stats after each run by deleting *.gcda files.

  Results

  • x264 1080p video : 9968 / 134203 lines
  • Apple 1080p trailer : 9968 / 134203 lines
  • Yahoo 1080p trailer : 9914 / 134203 lines

  I also ran this old x264-encoded file (ImperishableNightStage6Low.mp4) through the same test. It demonstrated the most code coverage with 10671 / 134203 lines.

  Conclusions
  Conclusions ? Ha ! Go ahead and jump all over this test. I’m already fairly confident that it’s impossible (or maybe just very difficult) to build a single H.264-encoded video that exercises every feature that FFmpeg’s decoder supports. For example, is it possible for a file to use both CABAC and CAVLC entropy methods ? If it’s possible, does any current encoder do that ?