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• fate : add test for asetnsamples filter with padding disabled

  7 août 2017, par Tobias Rapp

  fate : add test for asetnsamples filter with padding disabled
  Adds another test for asetnsamples filter where padding of the last
  
  frame is switched off. Renames the existing test to make the difference
  
  obvious.
  Tested-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : Tobias Rapp <t.rapp@noa-archive.com>
  

  • [DH] tests/fate/filter-audio.mak
  • [DH] tests/ref/fate/filter-asetnsamples
  • [DH] tests/ref/fate/filter-asetnsamples-nopad
  • [DH] tests/ref/fate/filter-asetnsamples-pad

• Change FPS in generate preview

  31 août 2017, par Pe Ťo

  Hi, I found very simple and working scipt but I cant change "speed" / duration of preview. It is set to 1 frame per second but I want it more speedier for example 0,6 sec/per frame. It is possible ? Thanx a lot.

  REM ----------------------------------------------
  
  set folder=C:\My videos
  
  set vframes=10
  
  set width=384
  
  set height=216
  
      rem w = h*16/9
  
  set filetypes=*.mp4
  
  REM ----------------------------------------------
  
  setlocal EnableDelayedExpansion
  
  
  
  pushd "%folder%"
  
  if not exist preview md preview
  
  for /f "usebackq delims=" %%f in (`dir /b %filetypes%`) do (
  
      if not exist "preview\%%~nf.mp4" (  
  
          for /f %%i in ('ffprobe -v error -show_entries format^=duration "%%f" -of default^=noprint_wrappers^=1:nokey^=1') do set length=%%i
  
          set /a length=!length!+0
  
          set /a fps=!length!/%vframes%
  
          ffmpeg -threads 2 -i "%%f" -an -qscale:v 1 -vf "fps=1/!fps!, scale=iw*min(%width%/iw\,%height%/ih):ih*min(%width%/iw\,%height%/ih):flags=lanczos, pad=%width%:%height%:(%width%-iw*min(%width%/iw\,%height%/ih))/2:(%height%-ih*min(%width%/iw\,%height%/ih))/2, unsharp=5:5:0.5:5:5:0.5" -vframes %vframes% -f image2pipe -vcodec ppm - ^
  
          | ffmpeg -y -threads 2 -framerate 1 -i pipe:0 -c:v libx264 -profile:v baseline -level 3.0 -tune stillimage -r 30 -pix_fmt yuv420p "preview\%%~nf.mp4"
  
      )
  
  cls
  
  )

• ffmpeg decoder seems to drop frames

  21 novembre 2018, par Aviv Sharon

  I am using avcodec (c++) api to decode video file frames and process them. I noticed that the decoded frames count is less than the expected\actual number of frames. The difference is 16 frames.
  While x frames were decoded with ffmpeg, VirtualDub says the same file has x+16 frames.
  Using ffprobe, I saw that the file contains x frames :

  $ ffprobe -v error -count_frames -select_streams v:0   -show_entries stream=nb_read_frames -of default=nokey=1:noprint_wrappers=1 inputFile.avi
  
  10875

  Furthermore, when I tried to extract the x+1 frame using ffmpeg utility, I got a failure :

  $  ffmpeg -i inputFile.avi -vf "select=eq(n\,10875)" -vframes 1 outPic.jpg
  
  ffmpeg version N-80801-gc0cb53c Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 27.100 / 55. 27.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 40.101 / 57. 40.101
  
    libavdevice    57.  0.102 / 57.  0.102
  
    libavfilter     6. 46.102 /  6. 46.102
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, avi, from 'inputFile.avi':
  
    Metadata:
  
      comment         : Recorder-v2
  
      encoder         : Lavf57.40.101
  
    Duration: 00:18:09.10, start: 0.000000, bitrate: 3421 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (xvid / 0x64697678), yuv420p, 1280x960 [SAR 1:1 DAR 4:3], 3420 kb/s, 10 fps, 10 tbr, 10 tbn, 10 tbc
  
  [swscaler @ 00000000021100a0] deprecated pixel format used, make sure you did set range correctly
  
  [image2 @ 0000000001f10540] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Output #0, image2, to 'outPic.jpg':
  
    Metadata:
  
      comment         : Recorder-v2
  
      encoder         : Lavf57.40.101
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc), 1280x960 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 10 fps, 10 tbn, 10 tbc
  
      Metadata:
  
        encoder         : Lavc57.48.101 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=   0x
  
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

  The interesting and weird part is that saving all frames of this movie in a sequence produced x+16 files (same frame number VirutalDub claims) :

  $ ffmpeg -i inputFile.avi "frames/out-%03d.jpg"
  
  ffmpeg version N-80801-gc0cb53c Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 27.100 / 55. 27.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 40.101 / 57. 40.101
  
    libavdevice    57.  0.102 / 57.  0.102
  
    libavfilter     6. 46.102 /  6. 46.102
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, avi, from 'inputFile.avi':
  
    Metadata:
  
      comment         : Recorder-v2
  
      encoder         : Lavf57.40.101
  
    Duration: 00:18:09.10, start: 0.000000, bitrate: 3421 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (xvid / 0x64697678), yuv420p, 1280x960 [SAR 1:1 DAR 4:3], 3420 kb/s, 10 fps, 10 tbr, 10 tbn, 10 tbc
  
  [swscaler @ 00000000020600a0] deprecated pixel format used, make sure you did set range correctly
  
  [image2 @ 0000000001d20540] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Output #0, image2, to 'frames/out-%03d.jpg':
  
    Metadata:
  
      comment         : Recorder-v2
  
      encoder         : Lavf57.40.101
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc), 1280x960 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 10 fps, 10 tbn, 10 tbc
  
      Metadata:
  
        encoder         : Lavc57.48.101 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  frame=10891 fps=120 q=24.8 Lsize=N/A time=00:18:09.10 bitrate=N/A dup=16 drop=0 speed=  12x
  
  video:384325kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  counted number of files/frames :

  $ ls -l frames/* | wc -l
  
      10891

  I am pretty much lost here. Any clue why avcodec decodes x frames and not x+16 ? Is ffmpeg misses frames ? Is VirtualDub maybe duplicate (16) frames ?

  Thanks