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• FFMPEG problem with concat outpoint option

  8 juillet 2021, par DavidB

  Trying to concatenate MP4 files

  


  ffmpeg -f concat -i c.txt -c copy concat.mp4


  


  c.txt file content

  


  ffconcat version 1.0
file first.mp4
outpoint 55000.0
file sec.mp4


  


  it is done but takes a too long time, and during processing throws a lot of errors

  


  [mp4 @ 0000020447e51100] pts has no value
[mp4 @ 0000020447e51100] Application provided duration: 2266868961 / timestamp: 2425630048 is out of range for mov/mp4 format
[mp4 @ 0000020447e51100] pts has no value
[mp4 @ 0000020447e51100] Application provided duration: 2266869984 / timestamp: 2425631072 is out of range for mov/mp4 format
[mp4 @ 0000020447e51100] pts has no value
[mp4 @ 0000020447e51100] Application provided duration: 2266871007 / timestamp: 2425632096 is out of range for mov/mp4 format
[mp4 @ 0000020447e51100] pts has no value
[mp4 @ 0000020447e51100] Application provided duration: 2266872030 / timestamp: 2425633120 is out of range for mov/mp4 format
[mp4 @ 0000020447e51100] pts has no value
[mp4 @ 0000020447e51100] Application provided duration: 2266873053 / timestamp: 2425634144 is out of range for mov/mp4 format

frame=111223 fps=11907 q=-1.0 Lsize=   19922kB time=15:18:27.42 bitrate=   3.0kbits/s speed=5.9e+03x
video:14229kB audio:2597kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 18.403999%


  


  I noticed that somehow it depends on file size or duration (e.g. if outpoint is 50000.0 it is ok and no errors) but I cannot get what is the exact problem.

  


• how to make one file from multi inputs using FFmpeg ?

  15 mars 2019, par rura6502

  I want to make FFmpeg application that reads the multiple streaming sources and then opens the streaming server (so that clients can connect to server). However, my FFmpeg’s resources are slow and every media resources have different speed.
  I found one good FFmpeg application example(exe, mfc) that collects multiple streaming sources and then open the TCP streaming server. When this application is executed, it does the following :

  1. running the FFmpeg as many as the sources.
  2. from every FFmpeg it creates only one dummy file (problem : this file size is always 0kb)
     • this is my guess. because I just can see the main FFmpeg app log and this log said just one input file(-i dummy) and after executing the example app a dummy file is created
  3. then the main FFmpeg reads the dummy file and then open the TCP streaming server

  I am curious about how this one dummy file is created from the FFmpeg application. Is there any similar options to create that dummy files from multiple FFmpeg ?

• Revision e4c5f7e2b6 : Delay decreasing reference count in frame-parallel decoding. The current decodi

  10 juin 2014, par hkuang

  Changed Paths :
   Modify /vp9/decoder/vp9_decoder.c

  
   Modify /vp9/vp9_dx_iface.c

  
  
  Delay decreasing reference count in frame-parallel decoding.

  The current decoding scheme will decrease the reference count
  of the output frame when finish decoding. Then the application
  could copy the frame from the decoder buffer to application buffer.
  In frame-parallel decoding, a decoded frame will not be outputted
  until several frames later which depends on thread numbers. So
  the decoded frame’s reference count should be decreased only
  after application finish copying the frame out. But due to the
  limitation of vpx_codec_get_frame, decoder could not know when
  application finish decoding. So use a index last_show_frame to
  release the last output frame’s reference count.

  Change-Id : I403ee0d01148ac1182e5a2d87cf7dcc302b51e63