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• ffmpeg - trying to add a reversed section of original video to the back (boomerang effect)

  23 janvier 2020, par sn0ep

  I have a ffmpeg command as follows which basically scales the video down to 720p. Now i want to add a section to my command which will make a concatination of the video but in reverse. So that the video will also be in a loop like this :

  0s -> 10s -> 0s

  original command :

  ffmpeg -ss 0.0 -to 10.0 -i in.mp4 -filter_complex "fps=15,scale=720:-1" -y out.mp4

  Command after my edits :

  ffmpeg -ss 0.0 -to 10.0 -i in.mp4 -filter_complex "[0:v]fps=15,scale=720:-1,reverse,fifo[r];[0:v][r] concat=n=2:v=1 [v]" -map "[v]" -y out.mp4

  When executing im getting following erorrs :

  Parsed_concat_4 @ 0x7feb89d01d40] Input link in1:v0 parameters (size 720x1280, SAR 1:1) do not match the corresponding output link in0:v0 parameters (1080x1920, SAR 1:1)
  
  [Parsed_concat_4 @ 0x7feb89d01d40] Failed to configure output pad on Parsed_concat_4
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #0:1

  I’m very new into coding advanced ffmpeg commands.

• ffmpeg : audio to opus and embed song cover to lossless vp9 in webm container

  14 mars 2020, par snow344

  im having some trouble in making a lossless webm of a audio file

  mpv plays it fine, but youtube won’t process it no matter what

  ffmpeg -i "audio.flac" -c:v vp9 -c:a libopus -lossless 1 -b:a 500k -pix_fmt yuv420p test.webm
  
  
  
      Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
  
      Stream #0:1: Video: mjpeg (Progressive), yuv444p(pc, bt470bg/unknown/unknown), 800x800 [SAR 300:300 DAR 1:1], 90k tbr, 90k tbn, 90k tbc (attached pic)
  
      Metadata:
  
        comment         : Cover (front)
  
  File 'test.webm' already exists. Overwrite? [y/N] y
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (mjpeg (native) -> vp9 (libvpx-vp9))
  
    Stream #0:0 -> #0:1 (flac (native) -> opus (libopus))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0000028ef88c6000] deprecated pixel format used, make sure you did set range correctly
  
  [libvpx-vp9 @ 0000028ef854cf00] v1.8.2
  
  Output #0, webm, to 'test.webm':
  
      Stream #0:0: Video: vp9 (libvpx-vp9), yuv420p(progressive), 800x800 [SAR 1:1 DAR 1:1], q=-1--1, 90k fps, 1k tbn, 90k tbc (attached pic)
  
      Metadata:
  
        comment         : Cover (front)
  
        encoder         : Lavc58.73.101 libvpx-vp9
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  
      Stream #0:1: Audio: opus (libopus), 48000 Hz, stereo, s16, 500 kb/s
  
      Metadata:
  
        encoder         : Lavc58.73.101 libopus
  
  frame=    1 fps=0.2 q=0.0 Lsize=   15327kB time=00:04:11.17 bitrate= 499.9kbits/s speed=53.7x
  
  video:386kB audio:14853kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.574758%

  thanks in advance

• FFmpeg : How can I loop a single frame of video to cover the length of audio track

  6 avril 2020, par John Bergqvist

  I have a VOB file holding an MPEG-2 video track with an AC-3 audio track. The video track of that VOB file consists of a single frame, which when played in a DVD player, holds that still frame until the audio track has finished.

  



  How can I (with FFMPEG ideally), loop that frame to make a "normal" video track that lasts for the length of the audio track, rather than just a single frame ?

  



  ffmpeg version N-91999-g148a21611d Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 8.2.1 (GCC) 20180813
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --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
  libavutil      56. 19.101 / 56. 19.101
  libavcodec     58. 30.100 / 58. 30.100
  libavformat    58. 18.102 / 58. 18.102
  libavdevice    58.  4.103 / 58.  4.103
  libavfilter     7. 32.100 /  7. 32.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
Input #0, mpeg, from '.\SINGLEFRAME.VOB':
  Duration: 00:00:47.94, start: 0.336711, bitrate: 439 kb/s
    Stream #0:0: Data: dvd_nav_packet
    Stream #0:1: Video: mpeg2video (Main), yuv420p(tv), 720x576 [SAR 16:15 DAR 4:3], 8000 kb/s, 25 tbr, 90k tbn, 50 tbc
    Stream #0:2: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s