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• Use FFMpeg libraries to read an audio file while it is being generated

  12 mai 2019, par EyAl

  I got an audio engine, which generates aac files. I want to mux this audio with some video. I’m using ffmpeg libraries to do just that - meaning, after the audio file is ready, I read it and mux it.
  Now - for performance reasons, I don’t want to wait until the audio engine completes the audio generation, I want the muxer to start reading the audio while it is being generated.
  Can I achieve that using the FFMpeg libraries ?
  Which approach should I take ?
  Couldn’t find any examples doing that

• perturbation of an audio/video decoding execution trace with gstreamer

  9 mars 2013, par KKc

  I am a new comer in gstreamer community and i have a pipeline to decode and trace a .mp4 file.

  gst-launch --gst debug=filesrc:7,queue:7,audioconvert:7,audioresample:7,qtdemux:7,faad:7,ffmpeg:7,audioresample:7,audioconvert:7,autoaudiosink:7,autovideosink:7,  filesrc location=...! qtdemux name=demuxer demuxer. ! queue ! faad ! audioconvert ! audioresample ! autoaudiosink demuxer. ! queue ! ffdec_h264 ! ffmpegcolorspace ! autovideosink > file1

  I inserted the "identity" component to disturb the decoding, and effectively, i saw images which became very slow and sound disappeared.
  I used this command :

  gst-launch --gst debug=filesrc:7,queue:7,audioconvert:7,audioresample:7,qtdemux:7,faad:7,ffmpeg:7,audioresample:7,audioconvert:7,autoaudiosink:7,autovideosink:7,  filesrc location=...! qtdemux name=demuxer demuxer. ! queue ! faad ! audioconvert ! audioresample ! autoaudiosink demuxer. ! queue ! identity sleep-time=1000000 ! ffdec_h264 ! ffmpegcolorspace ! autovideosink > file2

  The first time i did this execution, two new functions appeared in file2,

  (i) gst_ffmpegdec_chain...'skipping...',

  (ii) gst_ffmpegdec_video_frame...'Dropping..'

  I assumed that the meaning is that some data were dropped or something else

  However, since many days, i use the same pipelines, with the same video to decode ; i obtain the same bad visualization, but any new function in file 2 :(
  the only difference is the number of occurrence of the functions below :

  *gst_ffmpegdec_update_qos :...'update* 558 times in one case

  *gst_ffmpegdec_update_qos :...'update* 4 times in the other case

  I don't know why i am unable to produce again a disturbed trace with 'skipping..' and 'dropping..'

  My questions are :

  1- have you any idea about the meaning of the above functions ?

  2- Do you know any other component useful to disturb a A/V decoding processing ?

  Thank you for any reply

• using ffmpeg-lambda on net-core

  19 avril 2022, par user1765862

  I have a amazon lambda function which needs to use ffmpeg library.
I've found various examples on using ffmpeg lambda layer with nodejs runtime like this one
https://github.com/serverlesspub/ffmpeg-aws-lambda-layer but I would rather use .net core as runtime for my function instead of nodejs.

  


  Any suggestions ?