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• add libaribb24 ARIB STD-B24 caption decoder

  14 janvier 2019, par Jan Ekström

  add libaribb24 ARIB STD-B24 caption decoder
  * Outputs ASS lines with basic coloring and font scaling for each
  
    given region.
  
  * Sets the default style to the resolution of the subtitle plane
  
    (for example, 960x540 / 36pt font for profile A).
  
  * Has options to :
  
    * Disable ruby text (which is coded as regions which have
  
      half-height text in libaribb24).
  
      Enabled by default as without positioning ruby text only
  
      confuses as it is usually coded in the beginning of the decoded
  
      subtitle line.
  
    * Set the working directory, in which libaribb24 will read
  
      configuration as well as into which it may save broadcast extra
  
      symbols as PNG.
  
      Unset by default.
  The unconventional library check can be explained by the library's
  
  current master branch being licensed as LGPLv3, but at the time of
  
  writing the latest official release is still licensed under GPLv3.
  Thus, one either has to wait for the following release, or enable
  
  GPLv3.
  

  • [DH] Changelog
  • [DH] configure
  • [DH] doc/decoders.texi
  • [DH] libavcodec/Makefile
  • [DH] libavcodec/allcodecs.c
  • [DH] libavcodec/avcodec.h
  • [DH] libavcodec/codec_desc.c
  • [DH] libavcodec/libaribb24.c
  • [DH] libavcodec/profiles.c
  • [DH] libavcodec/profiles.h
  • [DH] libavcodec/version.h

• Adobe connect video : FLV to MP4 (export, convert)

  4 mai 2022, par Guillaume Chevalier

  I would like to convert an adobe connect video from .flv in the downloaded zip to .mp4. I have already done the steps explained in this question and answer, however I get .flv files organised like this inside the .zip :

  



  

  



  Moreover, I know that ffmpeg can merge video and sound files together as well as concatenating resulting clips directly from the command-line which could be quite useful : https://www.labnol.org/internet/useful-ffmpeg-commands/28490/

  



  I can't ask the owner of the video to make it available as an .mp4 from within the adobe connect admin interface. Briefly, I would like to listen to those videos in x2 speed in VLC (just like what I do when listening to random math classes on YouTube - I put ON the x2 speed). The amount of time I would gain to watch adobe connect videos in x2 speed is MASSIVE.

  



  I think I am not the only one that would like to do this. There are a lot of questions on forums about downloading adobe connect videos, but the .flv format mixed with some .xml is generally a killer when the host does not make the videos properly available in .mp4.

  



  Dealing with the order of the .flv files is a puzzle. At least, I would not care to flush the chat away and leave some details like that behind, that would help to reconstruct the videos. Any scripts to automate the process would be useful.

  


• avformat/mov : fix hang while seek on a kind of fragmented mp4

  3 février 2019, par Charles Liu

  avformat/mov : fix hang while seek on a kind of fragmented mp4
  Binary searching would hang if the fragment items do NOT have timestamp for the
  
  specified stream.
  For example, a fmp4 consists of separated 'moof' boxes for each track, and
  
  separated 'sidx' for each segment, but no 'mfra' box.  Then every fragment item
  
  only have the timestamp for one of its tracks.
  Example :
  
  ffmpeg -f lavfi -i testsrc -f lavfi -i sine -movflags dash+frag_keyframe+skip_trailer+separate_moof -t 1 out.mp4
  
  ffmpeg -ss 0.5 -i out.mp4 -f null none
  Also fixes the hang in ticket #7572, but not the reason for having
  
  AV_NOPTS_VALUE timestamps there.
  Signed-off-by : Charles Liu <liuchh83@gmail.com>
  
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/mov.c