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• capturing x11grab display from ffmpeg giveing "segmentation fault1 q=0.0"

  26 juin 2019, par user2369563

  In Debian 9, I am trying to record screen using ffmpeg over x11grab. it’s working great but sometimes its give error as shown below.
  Any idea what causing this ?

  exec error: Error: Command failed: ffmpeg -y  -f x11grab -s 1920x1080 -framerate 30 -i :1.0+0,0 -vsync 1 -c:v libx264 -preset ultrafast -crf 0 -pix_fmt yuv444p output.mkv
  
  ffmpeg version 3.2.14-1~deb9u1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  
    configuration: --prefix=/usr --extra-version='1~deb9u1' --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-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --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-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  [x11grab @ 0x55f87adcffa0] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  Input #0, x11grab, from ':1.0+0,0':
  
    Duration: N/A, start: 1561540173.584858, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 30 fps, 1000k tbr, 1000k tbn, 1000k tbc
  
  [libx264 @ 0x55f87adda860] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x55f87adda860] profile High 4:4:4 Predictive, level 4.0, 4:4:4 8-bit
  
  [libx264 @ 0x55f87adda860] 264 - core 148 r2748 97eaef2 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=0 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=cqp mbtree=0 qp=0
  
  Output #0, matroska, to 'output.mkv':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, 1920x1080, q=-1--1, 30 fps, 1k tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  Segmentation fault1 q=0.0 size=   10942kB time=00:00:02.40 bitrate=37332.4kbits/s speed=0.923x

• What settings do i need to do to fix this absolute path issue so that it accepts absolute path in the command ?

  22 juillet 2019, par Anonymous

  C:\Users\Shoubhik Das>ffmpeg -i C:\Users\Shoubhik Das\Desktop\test123.mp4 -ss 00:00:03 -to 00:00:17 -c:v copy -c:a copy C:\Users\Shoubhik Das\Desktop output5.mp4
  
  ffmpeg version 4.1.4 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.1.1 (GCC) 20190716
  
    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. 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
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  C:\Users\Shoubhik: No such file or directory

• Trimming videos using FFMPEG + Python : Invalid Argument

  26 juin 2019, par user2588534

  I am looking to use a short Python script to automate some video cutting for me based on a .txt file I created with timecodes. I use the following code for that :

  #!/usr/bin/env python3
  
  import subprocess
  
  first = True
  
  with open('VideoSlicepoints_Python.txt') as f:
  
    for line in f.readlines():
  
      if first:
  
          first = False
  
      else:
  
          filename, VideoDing_Timecode, Video_R4Start, Video_R4End, Video_R24Start, Video_R24End, Video_R0plus15 = line.strip().split(';')
  
          cmd = ['ffmpeg', '-i', filename, '-ss', Video_R4Start, '-to', Video_R4End, '-c', 'copy', '"S:/_RobotThesis/VideoRounds/' + filename[:-4] + '_r4' + filename[-4:] + '"']
  
          print(" ".join(cmd))
  
          subprocess.run(cmd, stderr=subprocess.STDOUT)

  This returns me with the following error when it is trying to loop over to videos :

  [NULL @ 0000027cddf8a100] Unable to find a suitable output format for '"S:/_RobotThesis/VideoRounds/log1_front_r4.MTS"'
  
  "S:/_RobotThesis/VideoRounds/log1_front_r4.MTS": Invalid argument

  Now, I thought it was a formatting issue, but when I input the command directly (as is visible in the CMD prompt), it works just fine :

  ffmpeg -i log1_front.MTS -ss 09:37.1 -to 11:37.1 -c copy "S:/_RobotThesis/VideoRounds/log1_front_r4.MTS"

  For reference, this is an excerpt of the .txt file I am using (it is based on a csv file, that’s why it has headers and I excluded the header in the script) :

  Filename;VideoDing_Timecode;Video_R4Start;Video_R4End;Video_R24Start;Video_R24End;Video_R0plus15
  
  log1_front.MTS;04:44.0;09:37.1;11:37.1;28:00.3;30:00.3;19:44.0
  
  log2_front.MTS;03:50.0;08:11.2;10:11.2;19:44.9;21:44.9;18:50.0
  
  log3_front.MTS;04:10.1;08:32.4;10:32.4;16:49.2;18:49.2;19:10.1
  
  log5_front.MTS;01:14.7;04:50.2;06:50.2;14:24.5;16:24.5;16:14.7

  Edit :

  Here is the full output in the CMD, if needed :

  ffmpeg -i log1_front.MTS -ss 09:37.1 -to 11:37.1 -c copy "S:/_RobotThesis/VideoRounds/log1_front_r4.MTS"
  
  ffmpeg version N-94054-gdd357d76e5 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8.3.1 (GCC) 20190414
  
    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-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    libavutil      56. 28.100 / 56. 28.100
  
    libavcodec     58. 53.100 / 58. 53.100
  
    libavformat    58. 27.103 / 58. 27.103
  
    libavdevice    58.  7.100 / 58.  7.100
  
    libavfilter     7. 55.100 /  7. 55.100
  
    libswscale      5.  4.101 /  5.  4.101
  
    libswresample   3.  4.100 /  3.  4.100
  
    libpostproc    55.  4.100 / 55.  4.100
  
  Input #0, mpegts, from 'log1_front.MTS':
  
    Duration: 00:37:35.05, start: 1.440000, bitrate: 12560 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(top first), 1440x1080 [SAR 4:3 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x101]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 256 kb/s
  
  [NULL @ 000002d1f347a100] Unable to find a suitable output format for '"S:/_RobotThesis/VideoRounds/log1_front_r4.MTS"'
  
  "S:/_RobotThesis/VideoRounds/log1_front_r4.MTS": Invalid argument