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• Is there an ffmpeg option to specify the size of macroblocks in H.264 compression ?

  24 septembre 2019, par MEHDI SAOUDI

  I am setting up a system that extract motion vectors from videos after compressing them in H.264 using FFmpeg

  Is there an FFMPEG H.264 compression option that allows modification of the size of the macroblocks in order to minimize the number of lines of the extracted motion vectors file ?

  In other words, if i change the compression of the mackroblocks from 4x4 to 8x8, I will minimize the size of the file?

  My goal is minimizing the size of the motion vector file. thank you

• ffmpeg error : could not get mpeg2 profile and level av_interleaved_write_frame() : Operation not permitted

  24 septembre 2019, par A Person

  Getting a weird error could not get mpeg2 profile and level av_interleaved_write_frame(): Operation not permitted and i do not understand how to fix it

  ffmpeg -i video.mpeg -i audio.wav -c copy -map 0:0 -map 1:0 out.mxf

  ffmpeg version N-94821-g976617c7d2 Copyright (c) 2000-2019 the FFmpeg developers
    built with gcc 9.1.1 (GCC) 20190807
    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-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-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
    libavutil      56. 35.100 / 56. 35.100
    libavcodec     58. 56.101 / 58. 56.101
    libavformat    58. 32.104 / 58. 32.104
    libavdevice    58.  9.100 / 58.  9.100
    libavfilter     7. 58.102 /  7. 58.102
    libswscale      5.  6.100 /  5.  6.100
    libswresample   3.  6.100 /  3.  6.100
    libpostproc    55.  6.100 / 55.  6.100
  Input #0, mpegvideo, from 'video.mpeg':
    Duration: N/A, bitrate: N/A
      Stream #0:0: Video: mpeg2video (High), yuv420p(tv, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1200k tbn, 50 tbc
  Guessed Channel Layout for Input Stream #1.0 : stereo
  Input #1, wav, from 'audio.wav':
    Duration: 00:07:36.16, bitrate: 1536 kb/s
      Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
  Output #0, mxf, to 'out.mxf':
    Metadata:
      encoder         : Lavf58.32.104
      Stream #0:0: Video: mpeg2video (High), yuv420p(tv, top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 25 tbr, 25 tbn, 25 tbc
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
  Stream mapping:
    Stream #0:0 -> #0:0 (copy)
    Stream #1:0 -> #0:1 (copy)
  Press [q] to stop, [?] for help
  [mxf @ 000001b5e48f9680] could not get mpeg2 profile and level
  av_interleaved_write_frame(): Operation not permitted
  

• ffmpeg vcodec copy does not work when start/duration is messed up in video file

  24 septembre 2019, par anishsane

  My Video file shows below meta-data with ffprobe/ffmpeg:

  Duration: 00:44:27.52, start: 1333.760000, bitrate: 335 kb/s
    Stream #0.0(und): Video: h264 (Main), yuv420p, 640x480, 25 tbr, 90k tbn, 50 tbc
  

  Note: The file does not contain audio.

  I am trying to convert this video file to other video file, using ffmpeg/avconv.

  This works: (but encodes h.264 video to mpeg4)

  ffmpeg -i input.mp4 output.mp4
  

  & it generates output file of proper duration (44:27 - 1333 seconds = 22:14)

  This does not work:

  ffmpeg -i input.mp4 -vcodec copy output.mp4
  

  Generates file without video.

  The output contains:

  $ avconv -i input.mp4 -vcodec copy output.mp4
  
  avconv version 0.8.9-6:0.8.9-0ubuntu0.13.10.1, Copyright (c) 2000-2013 the Libav developers
    built on Nov  9 2013 19:09:46 with gcc 4.8.1
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
    Metadata:
      major_brand     : dash
      minor_version   : 0
      compatible_brands: iso6avc1mp41
      creation_time   : 2014-01-19 22:43:21
    Duration: 00:44:27.52, start: 1333.760000, bitrate: 335 kb/s
      Stream #0.0(und): Video: h264 (Main), yuv420p, 640x480, 25 tbr, 90k tbn, 50 tbc
      Metadata:
        creation_time   : 2014-01-19 22:43:21
  Output #0, mp4, to 'output.mp4':
    Metadata:
      major_brand     : dash
      minor_version   : 0
      compatible_brands: iso6avc1mp41
      creation_time   : 2014-01-19 22:43:21
      encoder         : Lavf53.21.1
      Stream #0.0(und): Video: ![0][0][0] / 0x0021, yuv420p, 640x480, q=2-31, 90k tbn, 90k tbc
      Metadata:
        creation_time   : 2014-01-19 22:43:21
  Stream mapping:
    Stream #0:0 -> #0:0 (copy)
  Press ctrl-c to stop encoding
  frame=    0 fps=  0 q=-1.0 Lsize=       0kB time=10000000000.00 bitrate=   0.0kbits/s    
  video:0kB audio:0kB global headers:0kB muxing overhead inf%
  

• create single video form 3 separate videos using FFmpeg

  24 septembre 2019, par Shijin

  I was trying to create single video form 3 separate videos using FFmpeg.

  ffmpeg -y -loglevel debug  -i /home/ubuntu/test/1569317318/15693173181124138568.webm   -i /home/ubuntu/test/1569317318/1569317318867082351.webm   -i /home/ubuntu/test/1569317318/1569317318191333163.webm  -filter_complex '[0]scale=320:-1[a];[1]scale=320:-1[b];[2]scale=320:-1[c];[3]scale=320:-1[d];[a]pad=640:480[x];[x][b]overlay=320[y];[y][c]overlay=0:240[z];[z][d]overlay=320:240;[0][1]amix'  -c:v libx264   -crf 23   -preset veryfast   -shortest   /home/ubuntu/test/1569317318/1569317318478598265.mp4
  

  This is not woking, It throws an error like bellow

  Invalid file index 3 in filtergraph description [0]scale=320:-1[a];[1]scale=320:-1[b];[2]scale=320:-1[c];[3]scale=320:-1[d];[a]pad=640:480[x];[x][b]overlay=320[y];[y][c]overlay=0:240[z];[z][d]overlay=320:240;[0][1]amix.

  How to fix it? If we provide four inputs, It is working

• How to increase encoding speed of ffmpeg in adding text/sticker to video ?

  24 septembre 2019, par Gopinathan B

  While adding text/sticker to video using FFMPEG library in android. Processing time is very slow.

  For adding text to video I am using following command -

  cmd = arrayOf("-y", "-i", videoFile!!.path, "-vf", "drawtext=fontfile=" + font!!.path + ": text=" + text + ": fontcolor=" + color + ": fontsize=" + size + border + ": " + position, "-c:v", "libx264", "-preset", "ultrafast", "-c:a", "copy", "-movflags", "+faststart", outputFile.path)
  

  For adding sticker to video I am using following command -

  cmd = arrayOf("-y", "-i", videoFile!!.path, "-i", imagePath!!, "-filter_complex", position!!, "-preset", "ultrafast", "-codec:a", "copy", outputFile.path)
  

  While merging two video files also takes more time -

  cmd = if (havingAudio) {
     arrayOf("-y", "-i", videoFile!!.path, "-filter_complex", ffmpegFS!!, "-map", "[v]", "-map", "[a]", "-preset", "ultrafast", outputFile.path)
  } else {
     arrayOf("-y", "-i", videoFile!!.path, "-filter:v", ffmpegFS!!, "-preset", "ultrafast", outputFile.path) 
  }
  

  I have tried FFmpeg adding image watermark to video process is very slow. But processing time is not increased.

  Help me how to make processing time faster in FFMPEG.