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• FFMPEG support for HLS v4 and v5

  5 February 2015, by omkar

  As I understand latest FFMPEG version 2.0.1 supports till HLS version 3.

  After going through draft specifications for HLS:

  New features introduced in HLS V4 are:

  • Segments with bit range support with tag EXT-X-BYTERANGE
  • Support for fast forward and fast rewind with tags EXT-X-I-FRAMES-ONLY and EXT-X-I-FRAME-STREAM-INF
  • Alternate media option with tag EXT-X-MEDIA

  New features introduced in HLS V5 are:

  • Introduction of new attributes KEYFORMAT and KEYFORMATVERSIONS for tag EXT-X-KEY
  • Introduction of tag EXT-X-MAP
  • Support for subtitles by introduction of SUBTITLES value for attribute TYPE of tag EXT-X-MEDIA.

  Wanted to know which of the above features are planned to be implemented in FFMPEG library in near future? It will be great if you share the expected delivery dates or versions for these features.

  Thanks in advance.

• Having ffmpeg add a repeating text overlay on a video

  30 May 2020, by Caius Jard

  I'm looking to create an overlay that cycles through the characters in a string over and over. I've succeeded in using a sendcmd file to put A, B, C, D, E on the first 5 seconds of a video

  



  0  drawtext reinit 'text=A';
1  drawtext reinit 'text=B';
2  drawtext reinit 'text=C';
3  drawtext reinit 'text=D';
4  drawtext reinit 'text=E';


  



  But it doesn't cycle and I haven't been able to find a way to make it, because sendcmd looks like it just takes a simple timecode. I could make a command file 3600 lines long for my hour video, with those commands in over and over (the command file would be generated programmatically so not onerous)

  



  ---

  



  After some considerable experimenting I was able to do it with 5 separate drawtext:

  



  drawtext=fontfile=/Windows/Fonts/bauhs93.ttf:fontsize=1024:fontcolor=white@0.1:bordercolor=black@0.1:borderw=10:r=250:text='A':x=if(trunc(mod(t\,5))\,-2000\,(w-tw)/2),
drawtext=fontfile=/Windows/Fonts/bauhs93.ttf:fontsize=1024:fontcolor=white@0.1:bordercolor=black@0.1:borderw=10:r=250:text='B':x=if(trunc(mod(t\,5))-1\,-2000\,(w-tw)/2),
drawtext=fontfile=/Windows/Fonts/bauhs93.ttf:fontsize=1024:fontcolor=white@0.1:bordercolor=black@0.1:borderw=10:r=250:text='C':x=if(trunc(mod(t\,5))-2\,-2000\,(w-tw)/2),
drawtext=fontfile=/Windows/Fonts/bauhs93.ttf:fontsize=1024:fontcolor=white@0.1:bordercolor=black@0.1:borderw=10:r=250:text='D':x=if(trunc(mod(t\,5))-3\,-2000\,(w-tw)/2),
drawtext=fontfile=/Windows/Fonts/bauhs93.ttf:fontsize=1024:fontcolor=white@0.1:bordercolor=black@0.1:borderw=10:r=250:text='E':x=if(trunc(mod(t\,5))-4\,-2000\,(w-tw)/2)


  



  But as can be seen, I have to repeat a lot of stuff here. Is there any slicker way? It does seem to have a noticeable effect on encoding speed the more chars are added

  



  I was hoping that text expressions would help but it seems I can only return numerics from the values, so this expression didn't work out:

  



  %{e:if(trunc(mod(t,5)),'A', '')%{e:if(trunc(mod(t,5))-1,'B', '') ...


  


• configure: Move the bz2 and zlib checks below phtreads

  11 December 2013, by Luca Barbato

  configure: Move the bz2 and zlib checks below phtreads
  There are alternate implementations of those libraries that use pthreads.
  

  • [DH] configure