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• avformat/matroskadec : Support ContentCompression for all codecs

  6 décembre 2019, par Andreas Rheinhardt

  avformat/matroskadec : Support ContentCompression for all codecs
  The Matroska demuxer has three functions for creating packets out of
  
  the data read : One for certain RealAudio codecs (ATRAC3, cook, sipr,
  
  RealAudio 28.8), one for WebVTT (actually, the WebM flavour of it) and
  
  one for all the others. Only the last function supported Matroska's
  
  ContentCompression (e.g. it reversed zlib compression or added the
  
  removed headers to the packets). But in Matroska, all tracks are allowed
  
  to be compressed. This commit adds support for this.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskadec.c

• ffmpeg multiple pipes with different filters and outputs

  3 janvier 2024, par diegoddox

  I'm trying to pipe multiple outputs to an s3 but so far it's only working if I tried with only one pipe as soon as I add more I get Could not write header (incorrect codec parameters ?): Broken pipe error.

  


  aws s3 cp s3://bucket-name/original.mp4 - | \
  ffmpeg -f mp4 -i pipe:0 \
  -vf "scale=1280x720:flags=lanczos" -c:a aac -b:a 96k -movflags frag_keyframe+empty_moov -f mp4 pipe:1 | aws s3 cp - s3://bucket-name/720.mp4 --region my-region \
  -vf "scale=854x480:flags=lanczos" -c:a aac -b:a 96k -movflags frag_keyframe+empty_moov -f mp4 pipe:2 | aws s3 cp - s3://bucket-name/480.mp4 --region my-region \
  -vf "scale=640x360:flags=lanczos" -c:a aac -b:a 96k -movflags frag_keyframe+empty_moov -f mp4 pipe:3 | aws s3 cp - s3://bucket-name/360.mp4 --region my-region \
  -ss 00:00:00 -t 3 -vf "fps=10,scale=720:-1" -movflags frag_keyframe+empty_moov -f gif pipe:4 | aws s3 cp - s3://bucket-name/thumbnail.gif --region my-region


  


  Thanks in advance

  


• Using Qt Media Player on Raspberry Pi 1

  18 mai 2015, par Mauker

  I have a project built using Qt5 which has to play a video. Just like in the videowidget sample code.

  I’ve followed these instructions to build qt5 on my Pi. And it went just fine. But when I try to run any qt program that uses QMediaPlayer, I get the error message :

  defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"

  Which means I don’t have a backend to play the video, right ? Is there any one that I can use which will with Qt, like ffmpeg ? And how can I get it to work ? Specially for h264 videos.

  I’ve tried to install gstreamer as is told on this link, but it’s not working. Will I have to rebuild the entire qt5 again ?

  P.S. : I have the raspberry pi 1 model B with raspbian installed.

  Edit : As mentioned by Greenflow, I checked the ./configure log and saw that the GStreamer was compiled in, but the video apps are still not working...

  The message on the log was like this :

  GStreamer .............. yes (0.10)

  And the message on Greenflow’s log was like this :

  GStreamer .............. yes (1.0)

  Clearly it’s another version of GStreamer, but is it the problem ?

  I’ve also found this post which says QtMultimedia on the Pi is rather useless, but the post is from 2013, so I’m not sure if it’s really relevant. I’d like to have this app playing hardware accelerated videos on my Raspberry Pi, but I’m almost dropping the idea.

  Anyways, thanks Greenflow for the head start.

  Edit 2 : Found this thread on the Qtcentre. Damn, this thing is not going to be easy to solve, I guess...