Recherche avancée

Sur d’autres sites (9942)

• Merge remote-tracking branch ’qatar/master’

  10 février 2014, par Michael Niedermayer

  Merge remote-tracking branch ’qatar/master’
  * qatar/master :
  
    hevc : Conceal zero td
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/hevc_mvs.c

• Merge remote-tracking branch ’qatar/master’

  24 février 2014, par Michael Niedermayer

  Merge remote-tracking branch ’qatar/master’
  * qatar/master :
  
    doc : fix one accented word
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] doc/filters.texi

• FFMPEG generates an empty master playlist

  23 octobre 2019, par Сергей Барахтенко

  I use the following FFMPEG command to generate playlists and a master-playlist for later insertion into a player with HLS support :

  ffmpeg/ffmpeg.exe -i input/test.mp4 
  
  -preset fast  
  
  -g 150 
  
  -sc_threshold 0 
  
  -threads 4 
  
  -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 
  
  -filter:v:0 scale=h=240:w=-2  -minrate:v:0 75k  -maxrate:v:0 218k  -bufsize:v:0 300k -b:v:0 150k  
  
  -filter:v:1 scale=h=360:w=-2  -minrate:v:1 138k -maxrate:v:1 400k -bufsize:v:1 552k -b:v:1 276k 
  
  -filter:v:2 scale=h=480:w=-2 -minrate:v:2 375k -maxrate:v:2 1088k -bufsize:v:2 1500k -b:v:2 750k 
  
  -filter:v:3 scale=h=720:w=-2  -minrate:v:3 512k -maxrate:v:3 1485k -bufsize:v:3 2048k -b:v:3 1024k 
  
  -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2 v:3,a:3" 
  
  -master_pl_name master.m3u8 
  
  -f hls -hls_time 6 -segment_time 6 -hls_list_size 0 -segment_format mpegts 
  
  -hls_playlist_type vod -hls_segment_filename "output/conversion/K8eYn1X1/res-%v/segment-%d.ts"  output/conversion/K8eYn1X1/res-%v/playlist.m3u8 

  Based on information from various sources, this command line should do the following :

  1. take a video stream from the input file,

  2. apply filters with different settings four times,

  3. combine it into one stream,

  4. cut into TS-fragments for 6 seconds,

  5. write information about each resolution to the playlist.m3u8,

  6. create a master-playlist and write information about upcoming playlists in it

  Everything works correctly, BUT : fragments are created, playlists are created, but the master file is empty

  If you play with the command line, more precisely, leave only one filter, then everything works fine : and fragments are cut and playlists are created and a master-playlist is also created

  Also, I noticed that if I watched the folder in which all the files are stored, I noticed one thing : when using the command given above, a 7kb file is created, and then in the same second, it seems to be cleared . Why is this happening, I do not understand

  Upon completion of processing in the log, the last line :

  [hls @ 000001ff73b87200] Opening 'output/conversion/K8eYn1X1/master.m3u8' for writing

  Maybe I’m doing something wrong ? Maybe the commands are in the wrong order ? Tell me, who knows ?

  Thanks