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• FFMPEG for thumbnail from video distorted when downloaded

  17 juillet 2020, par bjacobs

  I am grabbing a thumbnail image from an mp4.

  


  When I use -c:v mjpeg, the thumbnail appears fine in the browser, but is completely distorted when I preview it on my Mac. If I use -c:v jpeg2000 the image looks fine on my Mac, but it does not show in the browser.

  


  Full command :

  


  ffmpeg -ss 3 -i https://some_site/some_video.mp4 -vf thumbnail,scale=480:480 -q:v 2 -frames:v 1 -f image2 -c:v jpeg2000 -r 1 -vframes 1 tmp/my_thumbnail.jpg

  


  -vs-

  


  ffmpeg -ss 3 -i https://some_site/some_video.mp4 -vf thumbnail,scale=480:480 -q:v 2 -frames:v 1 -f image2 -c:v mjpeg -r 1 -vframes 1 tmp/my_thumbnail.jpg

  


  What encoding do I need to use in order for the generated thumbnail to both be viewable in the browser and also preview-able on Mac ?

  


  This is what the distorted image looks like :


  


  I'm beginning to think this is an macOS issue, but even if it is, I'd like to know if FFMPEG would have a solution for it so that even users with the buggy OS can properly preview the image.

  


  Output :

  


  ffmpeg version 4.1.5 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8.3.0 (Alpine 8.3.0)
  configuration: --prefix=/usr --enable-avresample --enable-avfilter --enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --disable-stripping --disable-static --disable-librtmp --enable-vaapi --enable-vdpau --enable-libopus --disable-debug
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'https://some_site/some_video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isomavc1mp42
    creation_time   : 2020-02-28T16:46:30.000000Z
  Duration: 00:00:06.23, start: 0.000000, bitrate: 2004 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 480x480 [SAR 1:1 DAR 1:1], 1951 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2020-02-28T16:46:29.000000Z
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 48 kb/s (default)
    Metadata:
      creation_time   : 2020-02-28T16:46:29.000000Z
File 'tmp/my_thumbnail.jpg' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[swscaler @ 0x55acb21fbb00] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'tmp/my_thumbnail.jpg':
  Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isomavc1mp42
    encoder         : Lavf58.20.100
    Stream #0:0(und): Video: mjpeg, yuvj444p(pc), 480x480 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 1 fps, 1 tbn, 1 tbc (default)
    Metadata:
      creation_time   : 2020-02-28T16:46:29.000000Z
      encoder         : Lavc58.35.100 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
[Parsed_thumbnail_0 @ 0x55acb21e35c0] frame id #58 (pts_time=1.933333) selected from a set of 97 images
frame=    1 fps=0.0 q=2.0 Lsize=N/A time=00:00:01.00 bitrate=N/A dup=1 drop=1 speed=2.04x    
video:39kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown


  


• 'unsupported input sample rate set' error while converting mkv to mp3 with ffmpeg on python

  15 décembre 2020, par Agent Merlot

  I'm getting this error on trying to convert some mkv files to mp3 via python. Nearly all files got converted, but some are facing this issue.
  
https://cdn.discordapp.com/attachments/663255565451001866/788424224661569596/Error.txt

  


  Please help me fix this issue.

  


  ffmpeg output extracted from the discord link above :

  


  ffmpeg version git-2020-06-04-7f81785 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200523
  configuration: --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-libsrt --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-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 49.100 / 56. 49.100
  libavcodec     58. 90.100 / 58. 90.100
  libavformat    58. 44.100 / 58. 44.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 84.100 /  7. 84.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, matroska,webm, from 'J:\DC ED\Original\045 'Kimi no Egao ga Nani Yori mo Suki Datta' by 'Chicago Poodle'.mkv':
  Metadata:
    title           : 045 'Kimi no Egao ga Nani Yori mo Suki Datta' by 'Chicago Poodle'.mkv
    COPYRIGHT       : © 2013 APTX4869 Fansub
    creation_time   : 2020-11-18T05:03:06.000000Z
    COMPOSER        : Chicago Poodle
    ENCODER         : Lavf58.44.100
  Duration: 00:01:20.04, start: 0.000000, bitrate: 2023 kb/s
    Stream #0:0(jpn): Video: hevc (Main), yuv420p(tv), 1440x1080 [SAR 4:3 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
    Metadata:
      title           : VIDEO[AVC]
      ENCODER         : Lavc58.90.100 libx265
      BPS-eng         : 1831510
      DURATION-eng    : 00:01:20.039000000
      NUMBER_OF_FRAMES-eng: 1919
      NUMBER_OF_BYTES-eng: 18324032
      _STATISTICS_WRITING_APP-eng: mkvmerge v49.0.0 ('Sick Of Losing Soulmates') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-11-18 05:03:06
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1(jpn): Audio: aac (LC), 96000 Hz, stereo, fltp (default)
    Metadata:
      title           : AUDIO[AAC]
      BPS-eng         : 188626
      DURATION-eng    : 00:01:19.999000000
      NUMBER_OF_FRAMES-eng: 3750
      NUMBER_OF_BYTES-eng: 1886246
      _STATISTICS_WRITING_APP-eng: mkvmerge v49.0.0 ('Sick Of Losing Soulmates') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-11-18 05:03:06
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream mapping:
  Stream #0:1 -> #0:0 (aac (native) -> mp3 (mp3_mf))
Press [q] to stop, [?] for help
[mp3_mf @ 000002142f4a5fc0] MFT name: 'MP3 Encoder ACM Wrapper MFT'
[mp3_mf @ 000002142f4a5fc0] unsupported input sample rate set
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!


  


• Can't overlay a WebM transpartent video on top of a MP4 using ffmpeg [closed]

  27 octobre 2020, par Hervé

  I have been struggling for hours trying to overlay a WebM transpartent video on top of a MP4 using ffmpeg. The two videos have the same duration. It should therefore be easy but I am getting desperate.

  


  "c:\Program Files\ffmpeg\bin\ffmpeg.exe" ^
-i drone.mp4 ^
-i trans.webm -pix_fmt yuv444p  ^
-filter_complex "[1:v]format=rgba,colorchannelmixer=aa=0.5[trans];[0:v][trans]overlay=10:10" ^
out.mp4


  


  I tried MANY MANY different options, formats, but kept obtaining the same outcome : ffmpeg simply ignores the alpha channel of the trans.webm file and considers its background as black. I used the colorchannelmixer=aa=0.5 and the 10:10 offset to actually see the problem. My goal is really to keep the original subtle alpha channel of trans.webm, NOT to set the black color to transparent.

  


  Some information about the two files :

  


  drone.mp4

  


      Metadata:
    creation_time   : 2020-10-27T10:18:38.000000Z
    handler_name    : VideoHandler
    encoder         : h264
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 191 kb/s (default)
    Metadata:
    creation_time   : 2020-10-27T10:18:38.000000Z
    handler_name    : SoundHandler


  


  trans.webm

  


      Input #0, matroska,webm, from 'trans.webm':
    Metadata:
    ENCODER         : Lavf58.51.100
    Duration: 00:00:27.00, start: 0.000000, bitrate: 28 kb/s
    Stream #0:0: Video: vp9 (Profile 0), yuv420p(tv), 1920x1080, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
    Metadata:
    alpha_mode      : 1
    ENCODER         : Lavc58.100.100 libvpx-vp9
    DURATION        : 00:00:27.000000000