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• mp4 video rotation metadata removal

  6 mars 2019, par Horst Fiedler

  Using ffmpeg to remove rotate metadata works but output is little bit confusing as Metadata : rotate : 90 still appears in output section.

  ffmpeg version N-92663-g8affd75

  seems to keep rotate metadata :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid_20190302_162804987.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2019-03-02T15:28:43.000000Z
  
      com.android.version: 6.0.1
  
    Duration: 00:00:32.40, start: 0.000000, bitrate: 17230 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 17003 kb/s, SAR 1:1 DAR 16:9, 28.98 fps, 29.33 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : 2019-03-02T15:28:43.000000Z
  
        handler_name    : VideoHandle
  
        encoder         : MOTO
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-03-02T15:28:43.000000Z
  
        handler_name    : SoundHandle
  
  Output #0, mp4, to '1.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      com.android.version: 6.0.1
  
      encoder         : Lavf58.24.100
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 17003 kb/s, 28.98 fps, 29.33 tbr, 90k tbn, 90k tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : 2019-03-02T15:28:43.000000Z
  
        handler_name    : VideoHandle
  
        encoder         : MOTO
  
      Side data:
  
        displaymatrix: rotation of -0.00 degrees
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-03-02T15:28:43.000000Z
  
        handler_name    : SoundHandle

  but fortunatly the rotate is missing in succeeding ffmpeg (or ffprobe)

• Generate mp4 from m3u8 with EXT-X-START (FFMPEG)

  26 février 2019, par KPS1994

  I’m trying to generate a MP4 from a m3u8 playlist file using FFMPEG. The format of the file is as follows :

  #EXTM3U
  
  #EXT-X-VERSION:7
  
  #EXT-X-TARGETDURATION:607.0
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-MAP:URI=/path_to_mp4/2019-02-25_09-55-07.mp4
  
  #EXT-X-START:TIME-OFFSET=100
  
  #EXTINF:600.0,
  
  /path_to_m4s/2019-02-25_11-35-18.m4s
  
  #EXTINF:597.64,
  
  /path_to_m4s/2019-02-25_11-45-18.m4s
  
  #EXTINF:600.0,
  
  /path_to_m4s/2019-02-25_11-55-18.m4s
  
  #EXT-X-ENDLIST

  In the example above, each m4s chunk is 10 minutes long, but FFMPEG completely ignores the #EXT-X-START:TIME-OFFSET flag. Hence generating a video that is 30 minutes long as opposed to 29 minutes and 20 seconds.

  Any help on how to directly convert the m3u8 file would be most appreciated. (if there is a better tool than FFMEPG, then I am willing to try.)

• Unable to playback hardware encoded H.264 to RED5 server using FFmpeg

  26 février 2019, par Les

  I have a USB camera that is capable of H.264 on-board compression. I use the following FFmpeg command line to grab the encoded H.264 from the camera and put it in a ’flv’ container :

  ffmpeg -y -f dshow -vcodec h264 -i video="USB Camera" -vcodec copy -copyinkf -f flv c:\temp\test.flv 

  This works as expected and I can view the video using VLC no problem. Following this principle I then attempt to stream to a RED5 server using the following command :

  ffmpeg -y -f dshow -vcodec h264 -i video="USB Camera" -vcodec copy -copyinkf -f flv rtmp://192.168.75.34/live/livestream 

  The RED5 server detects the stream but I am unable to connect to it and view it using my basic Python program.

  If I do the same thing but use FFmpeg to carry out H.264 encoding of the default capture pin (MJPEG), it will stream correctly.

  I’m not sure if there is some flag in the command line that I might be missing ? Any help with this issue would be much appreciated.

  Here is the log output from the second FFmpeg command :

  C :\ffmpeg-latest-20190219\ffmpeg-static\bin>ffmpeg -y -f dshow -vcodec h264 -i video="USB Camera" -vcodec copy -copyinkf -f flv rtmp ://192.168.75.176/live/livestream"

  ffmpeg version N-93151-gff03418348 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 8.2.1 (GCC) 20190212
  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. 26.100 / 56. 26.100
  libavcodec 58. 47.102 / 58. 47.102
  libavformat 58. 26.101 / 58. 26.101
  libavdevice 58. 6.101 / 58. 6.101
  libavfilter 7. 48.100 / 7. 48.100
  libswscale 5. 4.100 / 5. 4.100
  libswresample 3. 4.100 / 3. 4.100
  libpostproc 55. 4.100 / 55. 4.100

  Input #0, dshow, from ’video=USB Camera’ :
  Duration : N/A, start : 1834145.825000, bitrate : N/A
  Stream #0:0 : Video : h264 (Main) (H264 / 0x34363248), yuv420p, 1920x1080, 30 fps, 30 tbr, 10000k tbn, 20000k tbc
  

  Output #0, flv, to ’rtmp ://192.168.75.176/live/livestream’ :
  Metadata :
  encoder : Lavf58.26.101
  Stream #0:0 : Video : h264 (Main) ([7][0][0][0] / 0x0007), yuv420p, 1920x1080, q=2-31, 30 fps, 30 tbr, 1k tbn, 10000k tbc

  Stream mapping :
  Stream #0:0 -> #0:0 (copy)
  Press [q] to stop, [?] for help
  frame= 39 fps=3.2 q=-1.0 Lsize= 976kB time=00:00:07.10 bitrate=1124.8kbits/s speed=0.59x
  video:975kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : 0.106110%