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• ffmpeg stuck in generating thumbnail of video [closed]

  10 décembre 2019, par user6121419

  I’m trying to create a thumbnail of a .mov video with ffmpeg, but it gets stuck.
  I tried the same command on 2 different machines and with different types of arguments, but nothing changed the result. The video itself can be viewed without a problem, so it shouldn’t be corrupted.
  The video was taken on an iphone at 4k 60fps.

  What I’ve tried :

  ffmpeg -i IMG_1001.MOV -ss 00:00:02 -vframes 1 thumbnail.jpg

  It gets stuck at the third last line frame= 0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=   0x and from then on, I stopped the process with ctrl+c

  Output :

  ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
 configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
 libavutil      55. 78.100 / 55. 78.100
 libavcodec     57.107.100 / 57.107.100
 libavformat    57. 83.100 / 57. 83.100
 libavdevice    57. 10.100 / 57. 10.100
 libavfilter     6.107.100 /  6.107.100
 libavresample   3.  7.  0 /  3.  7.  0
 libswscale      4.  8.100 /  4.  8.100
 libswresample   2.  9.100 /  2.  9.100
 libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'IMG_1001.MOV':
 Metadata:
   major_brand     : qt
   minor_version   : 0
   compatible_brands: qt
   creation_time   : 2019-11-xx
   com.apple.quicktime.make: Apple
   com.apple.quicktime.model: iPhone 8
   com.apple.quicktime.software: 13.2.2
   com.apple.quicktime.creationdate: 2019-11-xx
 Duration: 00:00:05.18, start: 0.000000, bitrate: 54961 kb/s
   Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709), 3840x2160, 54851 kb/s, 60 fps, 60 tbr, 600 tbn, 600 tbc (default)
   Metadata:
     creation_time   : 2019-11-xx
     handler_name    : Core Media Data Handler
     encoder         : HEVC
   Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 94 kb/s (default)
   Metadata:
     creation_time   : 2019-11-xx
     handler_name    : Core Media Data Handler
   Stream #0:2(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
   Metadata:
     creation_time   : 2019-11-xx
     handler_name    : Core Media Data Handler
   Stream #0:3(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
   Metadata:
     creation_time   : 2019-11-xx
     handler_name    : Core Media Data Handler
Stream mapping:
 Stream #0:0 -> #0:0 (hevc (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[swscaler @ 0x55d83a288940] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'thumbnail.jpg':
 Metadata:
   major_brand     : qt
   minor_version   : 0
   compatible_brands: qt
   com.apple.quicktime.creationdate: 2019-11-xx
   com.apple.quicktime.make: Apple
   com.apple.quicktime.model: iPhone 8
   com.apple.quicktime.software: 13.2.2
   encoder         : Lavf57.83.100
   Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 3840x2160, q=2-31, 200 kb/s, 60 fps, 60 tbn, 60 tbc (default)
   Metadata:
     creation_time   : 2019-11-xx
     handler_name    : Core Media Data Handler
     encoder         : Lavc57.107.100 mjpeg
   Side data:
     cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
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)

  Any idea on what it could be ? Am I missing something or could it be that the encoding can’t be read properly by ffmpeg ? Besides that I haven’t found any alternative to generate thumbnails from videos on linux

• Why does ffmpeg need DNS resolver as its dependencies ?

  20 décembre 2019, par Kshitij

  I was installing FFmpeg and libav today using brew install ffmpeg libav when I noticed unbound in the dependencies list.

  It’s very strange because unbound is DNS resolver and why ffmpeg would need it.

  ❯ brew install ffmpeg libav
  
  ==> Installing dependencies for ffmpeg: aom, frei0r, gmp, libtasn1, nettle, p11-kit, unbound, gnutls, lame, libass, libbluray, libsoxr, libvidstab, libvpx, opencore-amr, opus, libsndfile, libsamplerate, rubberband, sdl2, speex, giflib, leptonica, tesseract, theora, x264, x265 and xvid

  I even checked the info list for ffmpeg but unbound was not present there

  ❯ brew info ffmpeg
  
  ffmpeg: stable 4.2.1 (bottled), HEAD
  
  Play, record, convert, and stream audio and video
  
  https://ffmpeg.org/
  
  /usr/local/Cellar/ffmpeg/4.2.1_2 (287 files, 56.6MB)*
  
  - Poured from bottle on 2019-12-19 at 10:45:56
  
  From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/ffmpeg.rb
  
  ==> Dependencies
  
  Build: nasm ✘, pkg-config ✔, texi2html ✘
  
  Required: aom ✔, fontconfig ✔, freetype ✔, frei0r ✔, gnutls ✔, lame ✔, libass ✔, libbluray ✔, libsoxr ✔, libvidstab ✔, libvorbis ✔, libvpx ✔, opencore-amr ✔, openjpeg ✔, opus ✔, rtmpdump ✔, rubberband ✔, sdl2 ✔, snappy ✔, speex ✔, tesseract ✔, theora ✔, x264 ✔, x265 ✔, xvid ✔, xz ✔
  
  ==> Options
  
  --HEAD
  
      Install HEAD version
  
  ==> Analytics
  
  install: 66,434 (30 days), 280,128 (90 days), 1,079,492 (365 days)
  
  install-on-request: 48,053 (30 days), 203,583 (90 days), 759,254 (365 days)
  
  build-error: 0 (30 days)

  Links for reference

  • https://formulae.brew.sh/formula/ffmpeg
  • https://formulae.brew.sh/formula/unbound

• Python FFmpeg : Setting VBR and BT.709

  14 décembre 2019, par Cryptonaut

  I’m using this Python library to programmatically generate a short video using an image (.png) as input. The video needs to match the specifications of another video created by someone else.

  The key differences between my output and the other are the following (these are the media attributes I desire to have) :

  • BitRate_Mode : VBR
  • colour_primaries : BT.709 (Solved via the comment made by Rotem - updated my code example to include the solution)

  How would I achieve VBR ? It was my understanding ProRes 422 HQ natively used unconstrained VBR yet my output specifies CBR.

  Secondly, as can be seen from my code, I’m attempting to conform to BT.709. However, my media information output does not specify this. What am I doing incorrectly ?

  Here’s my code :

      image = ffmpeg.input(input_image, t='00:00:10', framerate='24000/1001', loop='1', probesize='42M')
  
  
  
      output = ffmpeg.output(image, output_video,
  
      f='mov',
  
      vcodec='prores_ks',
  
      vprofile='3',
  
      pix_fmt='yuv422p10le',
  
      g='48',
  
      video_track_timescale='24000',
  
      movflags='use_metadata_tags',
  
      timecode='00:00:00:00',
  
      color_primaries='bt709',
  
      color_trc='bt709',
  
      colorspace='bt709',
  
      qcomp='1',
  
      # BT.709 issue solved by adding the bsf option as seen via the line below
  
      bsf='prores_metadata=color_primaries=bt709:color_trc=bt709:colorspace=bt709', 
  
      vf='scale=in_range=full:in_color_matrix=bt709:out_range=full:out_color_matrix=bt709')
  
  
  
      output.run()

  Here’s the media information produced by my output :

  {
  
     "media":{
  
        "@ref":"Redacted",
  
        "track":[
  
           {
  
              "@type":"General",
  
              "VideoCount":"1",
  
              "OtherCount":"1",
  
              "FileExtension":"mov",
  
              "Format":"MPEG-4",
  
              "Format_Profile":"QuickTime",
  
              "CodecID":"qt  ",
  
              "CodecID_Version":"0000.02",
  
              "CodecID_Compatible":"qt  ",
  
              "FileSize":"196366623",
  
              "Duration":"10.010",
  
              "OverallBitRate":"156936362",
  
              "FrameRate":"23.976",
  
              "FrameCount":"240",
  
              "StreamSize":"2463",
  
              "HeaderSize":"28",
  
              "DataSize":"196364172",
  
              "FooterSize":"2423",
  
              "IsStreamable":"No",
  
              "File_Created_Date":"UTC 2019-12-13 19:26:37.150",
  
              "File_Created_Date_Local":"2019-12-13 19:26:37.150",
  
              "File_Modified_Date":"UTC 2019-12-13 19:27:20.303",
  
              "File_Modified_Date_Local":"2019-12-13 19:27:20.303"
  
           },
  
           {
  
              "@type":"Video",
  
              "StreamOrder":"0",
  
              "ID":"1",
  
              "Format":"ProRes",
  
              "Format_Version":"0",
  
              "Format_Profile":"422 HQ",
  
              "CodecID":"apch",
  
              "Duration":"10.010",
  
              "BitRate_Mode":"CBR",
  
              "BitRate":"156934237",
  
              "Width":"1920",
  
              "Height":"1080",
  
              "Sampled_Width":"1920",
  
              "Sampled_Height":"1080",
  
              "PixelAspectRatio":"1.000",
  
              "DisplayAspectRatio":"1.778",
  
              "Rotation":"0.000",
  
              "FrameRate_Mode":"CFR",
  
              "FrameRate":"23.976",
  
              "FrameCount":"240",
  
              "ColorSpace":"YUV",
  
              "ChromaSubsampling":"4:2:2",
  
              "ScanType":"Progressive",
  
              "Delay":"0.000",
  
              "StreamSize":"196364160",
  
              "Encoded_Library":"Lavc",
  
              "colour_description_present":"Yes",
  
              "colour_description_present_Source":"Stream",
  
              "colour_primaries_Source":"Stream",
  
              "transfer_characteristics_Source":"Stream",
  
              "matrix_coefficients_Source":"Stream"
  
           },
  
           {
  
              "@type":"Other",
  
              "StreamOrder":"1",
  
              "ID":"2",
  
              "Type":"Time code",
  
              "Format":"QuickTime TC",
  
              "Duration":"10.010",
  
              "FrameRate":"23.976",
  
              "TimeCode_FirstFrame":"00:00:00:00",
  
              "TimeCode_Striped":"Yes",
  
              "Language":"en",
  
              "Default":"No"
  
           }
  
        ]
  
     }
  
  }

  Here’s the media information spec I’m trying to match :

  {
  
     "media":{
  
        "@ref":"Redacted",
  
        "track":[
  
           {
  
              "@type":"General",
  
              "VideoCount":"1",
  
              "OtherCount":"1",
  
              "FileExtension":"mov",
  
              "Format":"MPEG-4",
  
              "Format_Profile":"QuickTime",
  
              "CodecID":"qt  ",
  
              "CodecID_Version":"2005.03",
  
              "CodecID_Compatible":"qt  ",
  
              "FileSize":"1397430682",
  
              "Duration":"70.737",
  
              "OverallBitRate_Mode":"VBR",
  
              "OverallBitRate":"158042403",
  
              "FrameRate":"23.976",
  
              "FrameCount":"1696",
  
              "StreamSize":"9898",
  
              "HeaderSize":"28",
  
              "DataSize":"1397420796",
  
              "FooterSize":"9858",
  
              "IsStreamable":"No",
  
              "Encoded_Date":"UTC 2019-04-29 22:26:32",
  
              "Tagged_Date":"UTC 2019-04-29 22:26:32",
  
              "File_Created_Date":"UTC 2019-12-12 16:52:57.215",
  
              "File_Created_Date_Local":"2019-12-12 16:52:57.215",
  
              "File_Modified_Date":"UTC 2019-12-12 17:25:58.903",
  
              "File_Modified_Date_Local":"2019-12-12 17:25:58.903",
  
              "Encoded_Application":"DVP Factory r561 (2019-04-25), Host: dvp07"
  
           },
  
           {
  
              "@type":"Video",
  
              "StreamOrder":"0",
  
              "ID":"1",
  
              "Format":"ProRes",
  
              "Format_Version":"0",
  
              "Format_Profile":"422 HQ",
  
              "CodecID":"apch",
  
              "Duration":"70.737",
  
              "Duration_LastFrame":"-0.000",
  
              "BitRate_Mode":"VBR",
  
              "BitRate":"158040381",
  
              "Width":"1920",
  
              "Height":"1080",
  
              "Sampled_Width":"1920",
  
              "Sampled_Height":"1080",
  
              "PixelAspectRatio":"1.000",
  
              "DisplayAspectRatio":"1.778",
  
              "Rotation":"0.000",
  
              "FrameRate_Mode":"CFR",
  
              "FrameRate":"23.976",
  
              "FrameCount":"1696",
  
              "ColorSpace":"YUV",
  
              "ChromaSubsampling":"4:2:2",
  
              "ScanType":"Progressive",
  
              "Delay":"0.000",
  
              "StreamSize":"1397420784",
  
              "Encoded_Library":"agi0",
  
              "Language":"en",
  
              "Encoded_Date":"UTC 2019-04-29 22:26:32",
  
              "Tagged_Date":"UTC 2019-04-29 22:26:32",
  
              "colour_description_present":"Yes",
  
              "colour_description_present_Source":"Container / Stream",
  
              "colour_primaries":"BT.709",
  
              "colour_primaries_Source":"Container",
  
              "colour_primaries_Original_Source":"Stream",
  
              "transfer_characteristics":"BT.709",
  
              "transfer_characteristics_Source":"Container",
  
              "transfer_characteristics_Original_Source":"Stream",
  
              "matrix_coefficients":"BT.709",
  
              "matrix_coefficients_Source":"Container / Stream"
  
           },
  
           {
  
              "@type":"Other",
  
              "StreamOrder":"1",
  
              "ID":"2",
  
              "Type":"Time code",
  
              "Format":"QuickTime TC",
  
              "Duration":"70.737",
  
              "FrameRate":"23.976",
  
              "TimeCode_FirstFrame":"00:00:00:00",
  
              "TimeCode_Striped":"Yes",
  
              "Language":"en",
  
              "extra":{
  
                 "Encoded_Date":"UTC 2019-04-29 22:26:32",
  
                 "Tagged_Date":"UTC 2019-04-29 22:26:32"
  
              }
  
           }
  
        ]
  
     }
  
  }