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• How to change output file name based on the parametars inside the command

  2 mai 2019, par Filip Glavica

  In this command, i am changing the resolution of a .yuv file to new resolution. I want to save the output file regarding the resolution i have changed it to.
  For example my video is called "skateboard.yuv", i want it to be called "skateboard_1280x720.yuv".

  Right now It is called the same as the input file"

  for %f in (*.yuv) do ffmpeg -s:v 1920x1080 -r 25 -i "%f" -vf scale=1280:720 -c:v rawvideo -pix_fmt yuv420p "%~nf.yuv"

  Thank you

• Concatenating *.mkv files using ffmpeg

  25 mars 2020, par Daniel F

  I’ve just about lost my mind on this, I’m sure I’m missing something simple.

  I have two *.mkv files generated by OBS. Even better, I’ve just copied one file twice, so I am sure I have the same bitrate, fps, tbn, whatever.

  then I do :

  ffmepg -i "concat:file1.mkv|file1_copy.mkv" -c copy test.mkv

  It runs and my screen fills with yellow messages :

      ffmpeg -i "concat:file1.mkv|file1_copy.mkv" -c copy test.mkv
  
  ffmpeg version 4.2 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.1.1 (GCC) 20190807
  
    configuration: --disable-static --enable-shared --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-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-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    libavutil      56. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  Input #0, matroska,webm, from 'concat:file1.mkv|file1_copy.mkv':
  
    Metadata:
  
      ENCODER         : Lavf58.20.100
  
    Duration: 00:00:09.15, start: 0.000000, bitrate: 2006 kb/s
  
      Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 60 fps, 60 tbr, 1k tbn, 120 tbc (default)
  
      Metadata:
  
        DURATION        : 00:00:09.150000000
  
      Stream #0:1: Audio: aac (LC), 44100 Hz, stereo, fltp (default)
  
      Metadata:
  
        title           : simple_aac_recording
  
        DURATION        : 00:00:09.102000000
  
  Output #0, matroska, to 'test.mkv':
  
    Metadata:
  
      encoder         : Lavf58.29.100
  
      Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 60 fps, 60 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        DURATION        : 00:00:09.150000000
  
      Stream #0:1: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 44100 Hz, stereo, fltp (default)
  
      Metadata:
  
        title           : simple_aac_recording
  
        DURATION        : 00:00:09.102000000
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [matroska,webm @ 00000156ce7f14c0] File extends beyond end of segment.
  
  [matroska @ 00000156cef62040] Non-monotonous DTS in output stream 0:0; previous: 9100, current: 0; changing to 9100. This may result in incorrect timestamps in the output file.
  
  [matroska @ 00000156cef62040] Non-monotonous DTS in output stream 0:0; previous: 9100, current: 67; changing to 9100. This may result in incorrect timestamps in the output file.
  
  [matroska @ 00000156cef62040] Non-monotonous DTS in output stream 0:0; previous: 9100, current: 33; changing to 9100. This may result in incorrect timestamps in the output file.
  
  [matroska @ 00000156cef62040] Non-monotonous DTS in output stream 0:1; previous: 9102, current: 0; changing to 9102. This may result in incorrect timestamps in the output file.
  
  [matroska @ 00000156cef62040] Non-monotonous DTS in output stream 0:0; previous: 9100, current: 17; changing to 9100. This may result in incorrect timestamps in the output file.
  
  
  
  ############## thousands of the above lines here #####################
  
  
  
  frame= 1098 fps=0.0 q=-1.0 Lsize=    2241kB time=00:00:09.11 bitrate=2013.0kbits/s speed=24.9x
  
  video:2068kB audio:159kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.607770%

  When opened, the timestamps only go to the end of the first segment, even though the video continues afterwards. Normally this would be fine, but I’m recording instructional videos and it would be nice for users to be able to skip around them. This occurs even if I re-encode the videos (which I shouldn’t need, since they are identical) or re-encode the output.

  Everything I have read online says :

  • re-encode*into .mkv to fix this, since .mkv has a fixed tbn - it’s already .mkv

  • the problem is different bitrates/tbs/fps/whatever - for now, they’re the same video twice

  • use -fflags +genpts, -use_wallclock_as_timestamps 1, vsync 0 -enc_time_base -1 - none of these do anything as far as I can tell, either before -i or after -c copy

  I’ve run out of ideas. What am I doing wrong.

• Carrierwave video not being processsed before uploading to S3

  12 décembre 2013, par Cramps

  I'm using Carrierwave, Carrierwave-video and Carrierwave-video-thumbnailer to process videos and make a thumbnail when they're uploaded. This was all working nicely while I was saving the files on my file system. However, now that I've added uploading to Amazon S3 using the carrierwave-aws gem, the videos are being uploaded to S3 without being processed first. It's as if the process encode_video and version :thumb are being skipped by the uploader.

  Here's what was working for me at first (before adding S3) :

  class VideoUploader < CarrierWave::Uploader::Base
  
  
  
  include CarrierWave::Video
  
  include CarrierWave::Video::Thumbnailer
  
  
  
  storage :file
  
  
  
  def store_dir
  
      "upload/path/"
  
  end
  
  
  
  process encode_video: [{ bunch of video options}]
  
  
  
  version :thumb do
  
      process thumbnail: [{ bunch of thumbnailer options }]
  
      def full_filename for_file
  
          png_name for_file, version_name
  
      end  
  
  end
  
  
  
  def png_name for_file, version_name
  
      %Q{#{version_name}_#{for_file.chomp(File.extname(for_file))}.png}
  
  end

  Now it's really just the same, except it's using storage :aws instead.