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• How to change frame rate of live stream using FFmpeg

  4 décembre 2012, par chiv

  I have created a streaming application, which takes video data from live source. Is there any transcoding tool which will receive stream from my streaming application and changes frame rate by transcoding the stream and re stream on another location ?

  currently I'm Struggling with FFmpeg code to use in Visual Studio 2010. And I wanted to integrate FFmpeg code in my application.

  Using FFmpeg.exe I'm able to transcode static files.I wont get any proper example how to transcode/change frame rate of live stream using FFmpeg. I tried,following command to re-stream on another IP.

        ffmpeg -re -i "rtp://my_ip:1234" -r 60 -f rtp "trp://my_ip:4321"

• lavc/vvc : Fix slice map construction for small subpics

  22 février, par Frank Plowman

  lavc/vvc : Fix slice map construction for small subpics
  In the case pps_subpic_less_than_one_tile_slice is called, the
  
  subpicture is smaller than the tile and so there are multiple
  
  subpictures in the tile.  Of course, then, not all the
  
  subpictures can start in the top-left corner as the code before the
  
  patch does.  Patch fixes this, so each subpicture starts at the
  
  signalled location as is specified in section 6.5.1 of H.266(V3).
  Signed-off-by : Frank Plowman <post@frankplowman.com>
  

  • [DH] libavcodec/vvc/ps.c

• Why is ffmpeg output video contrast / brightness too bright ?

  24 février 2024, par danday74

  I have a .mov file which I run through ffmpeg to create HLS segments / chunks. However, when I playback the HLS video it is too bright.

  


  For a sanity check, I ran the same .mov video file through the FlowPlayer processing pipeline and the results were the same, the output video is too bright !

  


  I have a number of videos. Most do not have this problem but some (and only some) of the .mov files exhibit this issue.

  


  A broken video stream reports (see below for full output) :

  


  Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67), 1920x1080, 8507 kb/s, 29.98 fps, 29.97 tbr, 600 tbn (default)


  


  A working video stream reports (see below for full output) :

  


  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160, 45457 kb/s, 29.99 fps, 29.97 tbr, 600 tbn (default)


  


  Is this something to do with hevc v h264 (whatever they mean) ?

  


  Incidentally, I am using the native HTML5 video player in conjunction with hls.js to playback the videos.

  


  How do I fix this ?

  


  Here is my ffmpeg command :

  


  ffmpeg -i "rgb.mov" \
  -v warning -preset ultrafast -g 59.96 -sc_threshold 0 \
  -map 0:0 -map 0:0 \
  -s:v:0 1920x1080 -c:v:0 libx264 -b:v:0 4521k \
  -s:v:1 1920x1080 -c:v:1 libx264 -b:v:1 7347k \
  -var_stream_map "v:0 v:1" \
  -master_pl_name master.m3u8 -f hls \
  -hls_time 6 -hls_list_size 0 -hls_playlist_type vod \
  -hls_segment_filename "hls/v%v/chunk%d.ts" "hls/v%v/index.m3u8"


  


  And here are some screenshots showing the original video in comparison to the output video.

  


  ORIGINAL :

  


  

  


  OUTPUT :

  


  

  


  For the problem video ffmpeg -i "rgb.mov" -hide_banner gives :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'rgb.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 0
    compatible_brands: qt
    creation_time   : 2021-08-03T11:23:40.000000Z
    com.apple.quicktime.location.accuracy.horizontal: 3.594173
    com.apple.quicktime.location.ISO6709: +51.5483+000.1628+000.459/
    com.apple.quicktime.make: Apple
    com.apple.quicktime.model: iPhone 12 Pro
    com.apple.quicktime.software: 14.7.1
    com.apple.quicktime.creationdate: 2021-08-03T12:23:40+0100
  Duration: 00:00:54.54, start: 0.000000, bitrate: 8730 kb/s
  Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67), 1920x1080, 8507 kb/s, 29.98 fps, 29.97 tbr, 600 tbn (default)
    Metadata:
      creation_time   : 2021-08-03T11:23:40.000000Z
      handler_name    : Core Media Video
      vendor_id       : [0][0][0][0]
      encoder         : HEVC
    Side data:
      DOVI configuration record: version: 1.0, profile: 8, level: 4, rpu flag: 1, el flag: 0, bl flag: 1, compatibility id: 4
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 172 kb/s (default)
    Metadata:
      creation_time   : 2021-08-03T11:23:40.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2021-08-03T11:23:40.000000Z
      handler_name    : Core Media Metadata
  Stream #0:3[0x4](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2021-08-03T11:23:40.000000Z
      handler_name    : Core Media Metadata
  Stream #0:4[0x5](und): Data: none (mebx / 0x7862656D), 34 kb/s (default)
    Metadata:
      creation_time   : 2021-08-03T11:23:40.000000Z
      handler_name    : Core Media Metadata
At least one output file must be specified


  


  For a working video ffmpeg -i "rgb.mov" -hide_banner gives :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'rgb.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 0
    compatible_brands: qt
    creation_time   : 2021-12-01T10:53:47.000000Z
    com.apple.quicktime.location.accuracy.horizontal: 4.785777
    com.apple.quicktime.location.ISO6709: +51.5485+000.1627+012.533/
    com.apple.quicktime.make: Apple
    com.apple.quicktime.model: iPhone 12 Pro
    com.apple.quicktime.software: 14.8.1
    com.apple.quicktime.creationdate: 2021-12-01T10:53:47+0000
  Duration: 00:00:36.35, start: 0.000000, bitrate: 45692 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160, 45457 kb/s, 29.99 fps, 29.97 tbr, 600 tbn (default)
    Metadata:
      creation_time   : 2021-12-01T10:53:47.000000Z
      handler_name    : Core Media Video
      vendor_id       : [0][0][0][0]
      encoder         : H.264
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 188 kb/s (default)
    Metadata:
      creation_time   : 2021-12-01T10:53:47.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2021-12-01T10:53:47.000000Z
      handler_name    : Core Media Metadata
  Stream #0:3[0x4](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2021-12-01T10:53:47.000000Z
      handler_name    : Core Media Metadata
  Stream #0:4[0x5](und): Data: none (mebx / 0x7862656D), 34 kb/s (default)
    Metadata:
      creation_time   : 2021-12-01T10:53:47.000000Z
      handler_name    : Core Media Metadata
At least one output file must be specified