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• Playback issues in VLC with low fps video from images using ffmpeg

  23 janvier 2017, par user2861936

  I am creating a short video from a sequence of 100 images using ffmpeg. There are several articles that helped me put together a command, but the one I’m using is directly taken from ffmpeg images-to-video script anyone ?.

  The following command produces a video file that plays well in all video players I have (OS X).

  cat input/*.jpg | ffmpeg -f image2pipe -r 10 -vcodec mjpeg -i - out.mp4

  But if I change it to,

  cat input/*.jpg | ffmpeg -f image2pipe -r 1 -vcodec mjpeg -i - out.mp4

  It plays well in all but VLC media player. VLC displays the initial 1 to 3 images, then just freezes on the frame. I’ve tested a few different frame rates, and it seems the cutoff that breaks the video playback in VLC lies somewhere between 1.125 and 1.175.

  Any advice on what I’m dealing with here would be much appreciated.

• avcodec/libkvazaar : Respect codec context color settings.

  2 octobre 2023, par John Mather

  avcodec/libkvazaar : Respect codec context color settings.
  This patch makes the libkvazaar encoder respect color settings that are
  
  present on the codec context, including color range, primaries, transfer
  
  function and colorspace.
  

  • [DH] libavcodec/libkvazaar.c

• Video captured from x11grab is not playable in HLS format on Firefox/Safari

  27 juillet 2022, par spartanz51

  I'm trying to produce an HLS playlist from a video file.

  


  It's a file captured from a virtual screen with ffmpeg and x11grab module :

  


  ffmpeg -y -t 10 -copyts -draw_mouse 0 -framerate 24 -f x11grab -thread_queue_size 1024 -i :0 -f pulse -i default -acodec copy /tmp/test_preprocessed.mkv


  


  But when I'm trying to produce HLS from this file, the output seems not correct, as it doesn't play in Firefox/Safari, but does play in Chrome (using hls.js or https://www.hlsplayer.net/ for example)

  


  Original file : https://transfer.sh/y1a6Fv/735171b9-42a1-461a-a118-981119bdf74e_preprocessed.mkv

  


  HLS Playlist generated from this file : https://video-staging-bucket.ams3.digitaloceanspaces.com/c08584ca-4731-4820-b5c7-71f12955c0b2/stackoverflow/playlist.m3u8

  


  (Works in https://www.hlsplayer.net/ with chrome, doesn't works with Firefox/Safari)

  


  How I'm producing the HLS :

  


  ffmpeg -y \
  -t 10 \
  -i 735171b9-42a1-461a-a118-981119bdf74e_preprocessed.mkv \
  -r 24 \
  -filter_complex '[0:v]split=3[v1][v2][v3]; [v1]scale=w=1280:h=720[v1out]; [v2]scale=w=854:h=480[v2out]; [v3]scale=w=640:h=360[v3out]' \
  -map '[v1out]' -c:v:0 libx264 -x264-params "nal-hrd=cbr:force-cfr=1" -b:v:0 3200k -maxrate:v:0 3200k -minrate:v:0 2500k -bufsize:v:0 3200k -preset slow -g 48 -sc_threshold 0 -keyint_min 48 \
  -map '[v2out]' -c:v:1 libx264 -x264-params "nal-hrd=cbr:force-cfr=1" -b:v:1 1600k -maxrate:v:1 1600k -minrate:v:1 1250k -bufsize:v:1 1600k -preset slow -g 48 -sc_threshold 0 -keyint_min 48 \
  -map '[v3out]' -c:v:2 libx264 -x264-params "nal-hrd=cbr:force-cfr=1" -b:v:2 900k -maxrate:v:2 900k -minrate:v:2 700k -bufsize:v:2 900k -preset slow -g 48 -sc_threshold 0 -keyint_min 48 \
  -map a:0 -c:a:0 aac -b:a:0 96k \
  -map a:0 -c:a:1 aac -b:a:1 128k \
  -map a:0 -c:a:2 aac -b:a:2 128k \
  -f hls \
  -hls_time 4 \
  -hls_playlist_type vod \
  -hls_flags independent_segments \
  -hls_segment_type mpegts \
  -hls_segment_filename 'hls'/stream_%v_data%02d.ts \
  -master_pl_name playlist.m3u8 \
  -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2" \
  -t 10 \
  'hls'/stream_%v.m3u8


  


  Is there something I missed ? Maybe a standard ? Or maybe problem is related to PTS/DTS of my file ?
Thanks !