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• In ffmpeg : Can't get peak bitrate values within 10% error tolerance for HLS playlist files

  5 octobre 2019, par ALS20394

  I’m using ffmpeg to produce several HLS variant playlists from an .mp4 file. When I check master.m3u8 file with mediastreamvalidator I get :

  Error : Measured peak bitrate compared to master playlist declared value exceeds error tolerance

  I understand that the error percentage needs to be less than 10%, and figured it out on 1 variant but not the three others. I’ve spent quite a bit of time adjusting the -maxrate and the -buffsize but the error percentage change is minimal. Beginning to wonder if I’m misunderstanding something ?

  This is the latest of what I enter :

  ffmpeg -i FHVid.mp4 \
  
  -b:v:0 5000k -maxrate 5250k -bufsize 5500k -profile:v main -c:v h264 -crf 20 -sc_threshold 0 -g 48 \
  
  -b:v:1 2800k -maxrate 2940k -bufsize 3100k -profile:v main -c:v h264 -crf 20 -sc_threshold 0 -g 48 \
  
  -b:v:2 1400k -maxrate 1540k -bufsize 1700k -profile:v main -c:v h264 -crf 20 -sc_threshold 0 -g 48 \
  
  -b:v:3 800k -maxrate 840k -bufsize 1050k -profile:v main -c:v h264 -crf 20 -sc_threshold 0 -g 48 \
  
  -b:a:0 192k \
  
  -b:a:1 128k \
  
  -b:a:2 128k \
  
  -b:a:3 96k \
  
  -c:a aac -ar 48000 -keyint_min 48 -map 0:v -map 0:a -map 0:v -map 0:a -map 0:v -map 0:a -map 0:v -map 0:a \
  
  -f hls -var_stream_map "v:0,a:0  v:1,a:1 v:2,a:2 v:3,a:3" \
  
  -master_pl_name FHVidmaster.m3u8 -hls_time 4 -hls_playlist_type vod \
  
  -hls_segment_filename 'file_%v_%03d.ts' out_%v.m3u8

  but I’ve also tried max rates that seem to be more standard

  -b:v:0 5000k -maxrate 5500k -bufsize 6500k
  
  -b:v:1 2800k -maxrate 3080k -bufsize 3200k
  
  -b:v:2 1400k -maxrate 1540k -bufsize 1900k
  
  -b:v:3 800k -maxrate 880k -bufsize 1050k

  The latest error message :

  Error: Measured peak bitrate compared to master playlist declared value exceeds error tolerance
  
  --> Detail:  Measured: 1111.54 kb/s, Master playlist: 1680.80 kb/s, Error: 33.87%
  
  --> Source:  /Users/Bun/Documents/CODING/CosmicPerspectiveAssets/01-FalconHeavy/HLS/FHVidmaster.m3u8
  
  --> Compare: out_2.m3u8
  
  
  
  --> Detail:  Measured: 1178.21 kb/s, Master playlist: 5711.20 kb/s, Error: 79.37%
  
  --> Source:  /Users/Bun/Documents/CODING/CosmicPerspectiveAssets/01-FalconHeavy/HLS/FHVidmaster.m3u8
  
  --> Compare: out_0.m3u8
  
  
  
  --> Detail:  Measured: 1109.03 kb/s, Master playlist: 3220.80 kb/s, Error: 65.57%
  
  --> Source:  /Users/Bun/Documents/CODING/CosmicPerspectiveAssets/01-FalconHeavy/HLS/FHVidmaster.m3u8
  
  --> Compare: out_1.m3u8

  Any help would be greatly appreciated on the -maxrate and -buffsize for variant playlists 0, 1, and 2. No adjustment I make seems to make any difference.

• avcodec/libdav1d : fix compilation after recent libdav1d API changes

  3 septembre 2021, par James Almer

  avcodec/libdav1d : fix compilation after recent libdav1d API changes
  They were done in preparation for an upcoming 1.0 release.
  
  Keep supporting previous releases for the time being.
  Reviewed-by : BBB
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/libdav1d.c

• How to display a progress bar while the Android ffmpeg command is executing in android studio ?

  23 juillet 2017, par Hemanth Kumar

  I’m having troubles displaying a progress bar that shows kb/s or a percentage like 1-100% when the ffmpeg command is executing.

  Here I’m doing video trimming using the ffmpeg command.
  I’m developing code in Android Studio.
  I want to display a progress bar to the user when the process is going on but I
  can’t do it.

  Please tell me how to extract process information from the ffmpeg command and display it using a progress bar.