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• Decoding h.264 in node.js without ffmpeg and send it to front or save it in fs

  5 mars 2019, par JT.v26

  I’m doing the final project of a bootcamp.

  The project consists of controlling a drone (Tello) with a mobile phone. So for this project I’m using react native. In which I insert a node.js inside the application (Node.js for Mobile Apps React Native) since the drone creates a wifi and I lose internet access to connect to a remote server.

  All right so far, the drone has three udp ports enabled on the sdk to receive instructions, send status and send video.
  The video gives it to me in raw.

  I did a test on the computer, downloading ffmpeg and converting that data and I could effectively have the video retransmission.

  My questions are :

  Is there any way I can use the same technique on the mobile without needing ffmpeg ?

  Is there any way to import ffmpeg into android and communicate with nodejs ?

  Is there any other solution where I can use another node that doesn’t have to be on the phone ?

  Or you may even find some other solution to address this problem.

  Thank you very much in advance

• avformat/matroskaenc : Avoid seek when writing Cues at the front

  29 décembre 2019, par Andreas Rheinhardt

  avformat/matroskaenc : Avoid seek when writing Cues at the front
  When the Cues are written in front of the Cluster, the muxer would seek
  
  to the beginning (to where the Cues ought to be written) and write the
  
  Cues ; afterwards it would seek back to the end of the file only to seek
  
  to the beginning once again to update several elements there. This
  
  commit removes the seek to the end.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskaenc.c

• avformat/matroskaenc : Only write Cues at the front if space has been reserved

  2 mai 2020, par Andreas Rheinhardt

  avformat/matroskaenc : Only write Cues at the front if space has been reserved
  If the AVIOContext for output was unseekable when writing the header,
  
  no space for Cues would be reserved even if the reserve_index_space
  
  option was used (because it is reasonable to expect that one can't seek
  
  back to the beginning to write the Cues anyway). But if the AVIOContext
  
  was seekable when writing the trailer, it was presumed that space for
  
  the Cues had been reserved when the reserve_index_space option indicated
  
  so even when it was not. As a result, the beginning of the file would be
  
  overwritten.
  This commit fixes this : If the reserve_index_space option had been used
  
  and no space has been reserved in advance because of unseekability when
  
  writing the header, then no attempt to write Cues will be performed
  
  when writing the trailer ; after all, writing them at the front is
  
  impossible and writing them at the end is probably undesired.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskaenc.c