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• How to extract subtitles from .wtv file using ffmpeg ?

  20 mai 2013, par user1978421

  does anyone know how to extract subtitles from a wtv file using ffmpeg ?
  i have tried many different commands. None of them works.
  the closest is this one

  ffmpeg -i input.wtv -vn -an -codec:s:0 srt test.srt

  But it complains Error while encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  what does that really mean ??

  The complete console output is as follows

  ffmpeg version N-52233-gee94362 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Apr 18 2013 02:50:33 with gcc 4.8.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 26.100 / 52. 26.100
  
    libavcodec     55.  2.100 / 55.  2.100
  
    libavformat    55.  2.100 / 55.  2.100
  
    libavdevice    55.  0.100 / 55.  0.100
  
    libavfilter     3. 56.103 /  3. 56.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [wtv @ 0269bac0] truncated file
  
      Last message repeated 3 times
  
  [mpeg2video @ 02692f60] Invalid frame dimensions 0x0.
  
      Last message repeated 12 times
  
  [wtv @ 0269bac0] max_analyze_duration 5000000 reached at 5016000 microseconds
  
  Input #0, wtv, from '16 and Pregnant- Unseen Moments_Viva_2013_04_09_19_57_00.wtv':
  
    Metadata:
  
      WM/MediaClassPrimaryID: db9830bd-3ab3-4fab-8a371a995f7ff74
  
      WM/MediaClassSecondaryID: ba7f258a-62f7-47a9-b21f4651c42a000
  
      Title           : 16 and Pregnant: Unseen Moments
  
      WM/SubTitleDescription: Dr Drew hosts a look at the exclusive moments we didn't see from the second season of 16 and Pregnant.
  
      genre           : Documentary;Reality TV
  
      WM/OriginalReleaseTime: 0
  
      WM/MediaCredits : ;;;
  
      service_provider: Viva
  
      service_name    : Viva
  
      WM/MediaOriginalChannel: 16
  
      WM/MediaOriginalChannelSubNumber: 0
  
      WM/MediaOriginalBroadcastDateTime: 2011-12-13T00:00:00Z
  
      WM/MediaOriginalRunTime: 38377217299
  
      WM/MediaIsStereo: false
  
      WM/MediaIsRepeat: true
  
      WM/MediaIsLive  : false
  
      WM/MediaIsTape  : false
  
      WM/MediaIsDelay : false
  
      WM/MediaIsSubtitled: false
  
      WM/MediaIsMovie : false
  
      WM/MediaIsPremiere: false
  
      WM/MediaIsFinale: false
  
      WM/MediaIsSAP   : false
  
      WM/MediaIsSport : false
  
      WM/Provider     : MediaCenterDefault
  
      WM/VideoClosedCaptioning: false
  
      WM/WMRVEncodeTime: 2013-04-09 18:57:02
  
      WM/WMRVSeriesUID: !GenericSeries!16 and Pregnant: Unseen Moments
  
      WM/WMRVServiceID: !Generated!be3ff88ee57a4cadb0334ef3df5bc91b
  
      WM/WMRVProgramID: !MCProgram!37282063
  
      WM/WMRVRequestID: 0
  
      WM/WMRVScheduleItemID: 0
  
      WM/WMRVQuality  : 0
  
      WM/WMRVOriginalSoftPrePadding: 480
  
      WM/WMRVOriginalSoftPostPadding: 60
  
      WM/WMRVHardPrePadding: -300
  
      WM/WMRVHardPostPadding: 0
  
      WM/WMRVATSCContent: false
  
      WM/WMRVDTVContent: true
  
      WM/WMRVHDContent: false
  
      Duration        : 38379654765
  
      WM/WMRVEndTime  : 2013-04-09 20:01:00
  
      WM/WMRVBitrate  : 2.118481
  
      WM/WMRVKeepUntil: 0
  
      WM/WMRVActualSoftPrePadding: 477
  
      WM/WMRVActualSoftPostPadding: 60
  
      WM/WMRVContentProtected: false
  
      WM/WMRVContentProtectedPercent: 0
  
      WM/WMRVExpirationSpan: 9223372036854775807
  
      WM/WMRVInBandRatingSystem: 255
  
      WM/WMRVInBandRatingLevel: 255
  
      WM/WMRVInBandRatingAttributes: 0
  
      WM/WMRVWatched  : true
  
    Duration: 01:03:58.07, start: 1.509175, bitrate: 2118 kb/s
  
      Stream #0:0[0x22](eng): Subtitle: dvb_subtitle
  
      Stream #0:1[0x23](eng): Audio: mp2 (P[0][0][0] / 0x0050), 48000 Hz, stereo, s16p, 256 kb/s
  
      Stream #0:2[0x24]: Video: mpeg2video (Main), yuv420p, 544x576 [SAR 32:17 DAR 16:9], 25 fps, 25 tbr, 10000k tbn, 50 tbc
  
      Stream #0:3[0x0]: Video: mjpeg, yuvj420p, 189x200 [SAR 96:96 DAR 189:200], 90k tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        title           : TV Thumbnail
  
  File 'test.srt' already exists. Overwrite ? [y/N] Output #0, srt, to 'test.srt':
  
    Metadata:
  
      WM/MediaClassPrimaryID: db9830bd-3ab3-4fab-8a371a995f7ff74
  
      WM/MediaClassSecondaryID: ba7f258a-62f7-47a9-b21f4651c42a000
  
      Title           : 16 and Pregnant: Unseen Moments
  
      WM/SubTitleDescription: Dr Drew hosts a look at the exclusive moments we didn't see from the second season of 16 and Pregnant.
  
      genre           : Documentary;Reality TV
  
      WM/OriginalReleaseTime: 0
  
      WM/MediaCredits : ;;;
  
      service_provider: Viva
  
      service_name    : Viva
  
      WM/MediaOriginalChannel: 16
  
      WM/MediaOriginalChannelSubNumber: 0
  
      WM/MediaOriginalBroadcastDateTime: 2011-12-13T00:00:00Z
  
      WM/MediaOriginalRunTime: 38377217299
  
      WM/MediaIsStereo: false
  
      WM/MediaIsRepeat: true
  
      WM/MediaIsLive  : false
  
      WM/MediaIsTape  : false
  
      WM/MediaIsDelay : false
  
      WM/MediaIsSubtitled: false
  
      WM/MediaIsMovie : false
  
      WM/MediaIsPremiere: false
  
      WM/MediaIsFinale: false
  
      WM/MediaIsSAP   : false
  
      WM/MediaIsSport : false
  
      WM/Provider     : MediaCenterDefault
  
      WM/VideoClosedCaptioning: false
  
      WM/WMRVEncodeTime: 2013-04-09 18:57:02
  
      WM/WMRVSeriesUID: !GenericSeries!16 and Pregnant: Unseen Moments
  
      WM/WMRVServiceID: !Generated!be3ff88ee57a4cadb0334ef3df5bc91b
  
      WM/WMRVProgramID: !MCProgram!37282063
  
      WM/WMRVRequestID: 0
  
      WM/WMRVScheduleItemID: 0
  
      WM/WMRVQuality  : 0
  
      WM/WMRVOriginalSoftPrePadding: 480
  
      WM/WMRVOriginalSoftPostPadding: 60
  
      WM/WMRVHardPrePadding: -300
  
      WM/WMRVHardPostPadding: 0
  
      WM/WMRVATSCContent: false
  
      WM/WMRVDTVContent: true
  
      WM/WMRVHDContent: false
  
      Duration        : 38379654765
  
      WM/WMRVEndTime  : 2013-04-09 20:01:00
  
      WM/WMRVBitrate  : 2.118481
  
      WM/WMRVKeepUntil: 0
  
      WM/WMRVActualSoftPrePadding: 477
  
      WM/WMRVActualSoftPostPadding: 60
  
      WM/WMRVContentProtected: false
  
      WM/WMRVContentProtectedPercent: 0
  
      WM/WMRVExpirationSpan: 9223372036854775807
  
      WM/WMRVInBandRatingSystem: 255
  
      WM/WMRVInBandRatingLevel: 255
  
      WM/WMRVInBandRatingAttributes: 0
  
      WM/WMRVWatched  : true
  
      Stream #0:0(eng): Subtitle: srt
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (dvbsub -> srt)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

• FFmpeg rtp streaming opus file problems

  22 avril 2017, par Yuriy Aizenberg

  i have the next situation.

  1. Have file on remote VPS server.
  2. I want that this file (opus codec) can be accessible through RTP on my android phone.

  3. I tried ffmpeg with next command :

     ffmpeg -ar 44800 -i bon_jovi_loverboy.opus -acodec libopus -ac 1 -ab 96k -vn -f rtp rtp://127.0.0.1:5004 -loglevel 56

  But got next error :

  bon_jovi_loverboy.opus: Invalid data found when processing input

  Full log :

  root@cs82932 :/home/rstream/rtstream/src# ffmpeg -ar 44800 -i bon_jovi_loverboy.opus -acodec libopus -ac 1 -ab 96k -vn -f rtp rtp ://127.0.0.1:5004 -loglevel 56
  ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1 16.04.4) 20160609
  configuration : —prefix=/usr —extra-version=0ubuntu0.16.04.1 —build-suffix=-ffmpeg —toolchain=hardened —libdir=/usr/lib/x86_64-linux-gnu —incdir=/usr/include/x86_64-linux-gnu —cc=cc —cxx=g++ —enable-gpl —enable-shared —disable-stripping —disable-decoder=libopenjpeg —disable-decoder=libschroedinger —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-libmodplug —enable-libmp3lame —enable-libopenjpeg —enable-libopus —enable-libpulse —enable-librtmp —enable-libschroedinger —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-libzvbi —enable-openal —enable-opengl —enable-x11grab —enable-libdc1394 —enable-libiec61883 —enable-libzmq —enable-frei0r —enable-libx264 —enable-libopencv
  libavutil 54. 31.100 / 54. 31.100
  libavcodec 56. 60.100 / 56. 60.100
  libavformat 56. 40.101 / 56. 40.101
  libavdevice 56. 4.100 / 56. 4.100
  libavfilter 5. 40.101 / 5. 40.101
  libavresample 2. 1. 0 / 2. 1. 0
  libswscale 3. 1.101 / 3. 1.101
  libswresample 1. 2.101 / 1. 2.101
  libpostproc 53. 3.100 / 53. 3.100
  Splitting the commandline.
  Reading option ’-ar’ ... matched as option ’ar’ (set audio sampling rate (in Hz)) with argument ’44800’.

  Reading option ’-i’ ... matched as input url with argument ’bon_jovi_loverboy.opus’.

  Reading option ’-acodec’ ... matched as option ’acodec’ (force audio codec (’copy’ to copy stream)) with argument ’libopus’.

  Reading option ’-ac’ ... matched as option ’ac’ (set number of audio channels) with argument ’1’.

  Reading option ’-ab’ ... matched as option ’ab’ (audio bitrate (please use -b:a)) with argument ’96k’.

  Reading option ’-vn’ ... matched as option ’vn’ (disable video) with argument ’1’.

  Reading option ’-f’ ... matched as option ’f’ (force format) with argument ’rtp’.

  Reading option ’rtp ://127.0.0.1:5004’ ... matched as output url.

  Reading option ’-loglevel’ ... matched as option ’loglevel’ (set logging level) with argument ’56’.

  Finished splitting the commandline.
  Parsing a group of options : global .
  Applying option loglevel (set logging level) with argument 56.

  Successfully parsed a group of options.

  Parsing a group of options : input url bon_jovi_loverboy.opus.
  Applying option ar (set audio sampling rate (in Hz)) with argument 44800.
  Successfully parsed a group of options.
  Opening an input file : bon_jovi_loverboy.opus.

  [AVIOContext @ 0x965e60] Statistics : 36389 bytes read, 0 seeks
  bon_jovi_loverboy.opus : Invalid data found when processing input

  What wrong ? Thanks

  UPD

  I update ffmpeg and streaming looks successfully.

      ffmpeg -stream_loop -1 -i 4a6u7-ptl2w.opus -acodec libopus -ac 1 -ab 
  
             96k -vn -f rtp rtp://95.213.195.192:5004/f.opus
  
  ffmpeg version 3.2.4-1~16.04.york1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.1 (Ubuntu 5.4.1-5ubuntu2~16.04.york1) 20170210
  
    configuration: --prefix=/usr --extra-version='1~16.04.york1' --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
  
  Input #0, ogg, from '4a6u7-ptl2w.opus':
  
    Duration: 00:02:34.21, start: 0.000000, bitrate: 69 kb/s
  
      Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
  
      Metadata:
  
        ENCODER         : Lavc57.77.100 libopus
  
  Output #0, rtp, to 'rtp://95.213.195.192:5004/f.opus':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Audio: opus (libopus), 48000 Hz, mono, flt, 96 kb/s
  
      Metadata:
  
        encoder         : Lavc57.64.101 libopus
  
  SDP:
  
  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No Name
  
  c=IN IP4 95.213.195.192
  
  t=0 0
  
  a=tool:libavformat 57.56.101
  
  m=audio 5004 RTP/AVP 97
  
  b=AS:96
  
  a=rtpmap:97 opus/48000/2
  
  
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (opus (native) -> opus (libopus))
  
  Press [q] to stop, [?] for help
  
  size=   44893kB time=00:52:18.12 bitrate= 117.2kbits/s speed=56.5x

  But when i try to connect by rtp from local PC (VLC Player) i get the exception :

           core error: socket bind error: Cannot assign requested address
  
           core error: open of `rtp://95.213.195.192:5004/f.opus' failed

  When i try ffplay on remote pc (same where ffmpeg) :

      ffplay rtp://95.213.195.192:5004/f.opus
  
  
  
  ffplay version 3.2.4-1~16.04.york1 Copyright (c) 2003-2017 the FFmpeg developers
  
    built with gcc 5.4.1 (Ubuntu 5.4.1-5ubuntu2~16.04.york1) 20170210
  
    configuration: --prefix=/usr --extra-version='1~16.04.york1' --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
  
  Segmentation fault

  Can you help me ? Thanks

  95.213.195.192 - IP of my remote server with file

• FFMPEG to create an MPEG-DASH stream with VP8

  24 avril 2017, par Kenneth Worden

  I’m trying to use FFMPEG to stream a live video feed from my webcam /dev/video0. Following scattered tutorials and scarce documentation (is this a known problem for the encoding community ?) I arrived at the following bash script :

  #!/bin/bash
  
  
  
  ffmpeg \
  
      -y \
  
      -f v4l2 \
  
          -i /dev/video0 \
  
          -s 640x480 \
  
          -input_format mjpeg \
  
          -r 24 \
  
      -map 0:0 \
  
      -pix_fmt yuv420p \
  
      -codec:v libvpx \
  
          -s 640x480 \
  
          -threads 4 \
  
          -b:v 50k \
  
          -tile-columns 4 \
  
          -frame-parallel 1 \
  
          -keyint_min 24 -g 24 \
  
      -f webm_chunk \
  
          -header "stream.hdr" \
  
          -chunk_start_index 1 \
  
      stream_%d.chk &
  
  
  
  sleep 2
  
  
  
  ffmpeg \
  
      -f webm_dash_manifest -live 1 \
  
      -i stream.hdr \
  
      -c copy \
  
      -map 0 \
  
      -f webm_dash_manifest -live 1 \
  
          -adaptation_sets "id=0,streams=0" \
  
          -chunk_start_index 1 \
  
          -chunk_duration_ms 1000 \
  
          -time_shift_buffer_depth 30000 \
  
          -minimum_update_period 60000 \
  
      stream_manifest.mpd

  When I run this script, my webcam light turns on, the stream.hdr and stream_manifest.mpd files are written, and chunks start to be created (i.e. stream_1.chk, stream_2.chk, etc...). However, FFMPEG throws the following error :

  Could not write header for output file #0 (incorrect codec parameters
   ?) : Invalid data found when processing input

  I will explain what I think I am doing with this script, and hopefully this will expose any errors in my thinking.

  First, we invoke FFMPEG to use Video for Linux 2 (v4l2) to read from my webcam (/dev/video0) of a resolution 640x480. The input format is mjpeg with a framerate of 24fps.

  I then declare that FFMPEG should "map" (copy) the video stream output by v4l2 to a file. I specify the pixel format (YUV420P) and use libvpx (VP8 encoding) to encode the video stream. I set the size to be 640x480, use 4 threads, set the bitrate to be 50kbps, do some magic with tile-columns and frame-parallel options, and set the I-frames to be 24 frames apart.

  I then create a stream.hdr file. The starting index is 1. This command continues to run infinitely until I kill it, grabbing new video from my webcam and outputting it into chunks.

  I then sleep for 2 seconds to give the previous command time to generate a header file.

  And that’s really it. The next invocation of FFMPEG simply creates the MPEG-DASH manifest file given the header generated in the previous step.

  So what’s going on ? Why can I not view the video in a web browser (I’m using Dash.js) ? I serve the manifest, header, and chunks on a Node.js server so that trivial issue is not the problem.

  ---

  Edit : Here is my full console output.

  ffmpeg version 3.0.7-0ubuntu0.16.10.1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.2.0 (Ubuntu 6.2.0-5ubuntu12) 20161005
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.10.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --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-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --enable-librtmp --enable-libschroedinger --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-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-chromaprint --enable-libx264
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libavresample   3.  0.  0 /  3.  0.  0
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  [video4linux2,v4l2 @ 0x55847e244ea0] The driver changed the time per frame from 1/24 to 1/30
  
  [mjpeg @ 0x55847e245c00] Changing bps to 8
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 64305.102081, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 640x480, -5 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
  
  Codec AVOption frame-parallel (Enable frame parallel decodability features) specified for output file #0 (stream_%d.chk) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  Codec AVOption tile-columns (Number of tile columns to use, log2) specified for output file #0 (stream_%d.chk) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  [swscaler @ 0x55847e24b720] deprecated pixel format used, make sure you did set range correctly
  
  [libvpx @ 0x55847e248a20] v1.5.0
  
  Output #0, webm_chunk, to 'stream_%d.chk':
  
    Metadata:
  
      encoder         : Lavf57.25.100
  
      Stream #0:0: Video: vp8 (libvpx), yuv420p, 640x480, q=-1--1, 50 kb/s, 30 fps, 30 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.24.102 libvpx
  
      Side data:
  
        unknown side data type 10 (24 bytes)
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> vp8 (libvpx))
  
  Press [q] to stop, [?] for help
  
  frame=   21 fps=0.0 q=0.0 size=N/A time=00:00:00.70 bitrate=N/A dup=5 drop=frame=   36 fps= 35 q=0.0 size=N/A time=00:00:01.20 bitrate=N/A dup=5 drop=frame=   51 fps= 33 q=0.0 size=N/A time=00:00:01.70 bitrate=N/A dup=5 drop=ffmpeg version 3.0.7-0ubuntu0.16.10.1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.2.0 (Ubuntu 6.2.0-5ubuntu12) 20161005
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.10.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --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-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --enable-librtmp --enable-libschroedinger --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-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-chromaprint --enable-libx264
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libavresample   3.  0.  0 /  3.  0.  0
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, webm_dash_manifest, from 'stream.hdr':
  
    Metadata:
  
      encoder         : Lavf57.25.100
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        webm_dash_manifest_file_name: stream.hdr
  
        webm_dash_manifest_track_number: 1
  
  Output #0, webm_dash_manifest, to 'stream_manifest.mpd':
  
    Metadata:
  
      encoder         : Lavf57.25.100
  
      Stream #0:0: Video: vp8, yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        webm_dash_manifest_file_name: stream.hdr
  
        webm_dash_manifest_track_number: 1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid data found when processing input
  
  frame=   67 fps= 33 q=0.0 size
  
  frame=   82 fps= 32 q=0.0 size=N/A time=00:00:02.73 bitrate=N/A dup=5 drop=
  
  frame=   97 fps= 32 q=0.0 size=N/A time=00:00:03.23 bitrate=N/A dup=5 drop=
  
  frame=  112 fps= 32 q=0.0 size=N/A time=00:00:03.73 bitrate=N/A dup=5 ...