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• FFmpeg Error Checking : Broken or missing AVI Index

  17 avril 2017, par Jake

  I have three example videos, good.avi, damaged1.avi, and damaged2.avi. The first will play in VLC, but the second two both error with the same "Broken or missing AVI Index" message.

  I have thousands of these videos which I need to process in MATLAB, so I’m trying to error check using FFmpeg like this : ffmpeg -v error -i vidname.avi -f null - 2>&1

  Now here’s the part I don’t understand :
  On good.avi it completes with no output -OK
  On damaged1.avi it outputs [mjpeg @ 0x7fc1dd813800] overread 1 -OK
  On damaged2.avi it completed with no output as in good.avi - ?????

  Would someone with video codec/FFmpeg experience please help me understand what’s going on here so I can develop a more robust error check ?

  They also both have identical codec details in VLC :
  

• How to use libvlc for low-frame-rate rtsp stream decoding

  11 mai 2017, par user1547688

  I am using libvlc for RTSP h.264 bitstream decoding and display in PC. For the best experience (i.e. low latency), I uses the following options

  :file-caching=0
  
  :tcp-caching=0
  
  :rtsp-caching=0
  
  :network-caching=0
  
  :clock-jitter=0
  
  :avcodec-fast

  With these parameters, the latency is acceptable in comparison to the open-source project "ONVIF device manager"(ODM) where FFMPEG is used for decoding.

  When RTSP server deliver low frame-rate RTSP stream, (1 frame/second). These configuration will freeze after displaying a few frames (3-5 frames).

  I have tried 2 different approaches

  1. Disable synchronization by

     :clock-synchro=0

  This will enable the decoding process to go on, however, an accumulated period of time lagging could be observed.

  2. Use network-cache

  My experiments shows that

  :network-caching=1200

  Will make decoding go smoothly, however, the latency is over 1-2 second in comparison to ODM.

  Is there a way to handle the low frame rate issue in libvlc without providing such big latency ?

• How to record watching statistics in hls streaming

  5 juillet 2023, par qmksbp

  I implemented a vod streaming system that converts videos to hls with ffmpeg.

  


  And I made a Django program that gives playlists and ts files to the player so that the video can be played.

  


  But I don't know how to record the watching statistics.

  


  I used vediojs and I know that I can send the watching time from the client to the server and record it.

  


  But We are sure that this method is not accurate and the user can change the statistics.

  


  On the other hand, I have seen vod platforms that do not take the statistics from the player (client) at all, as if the statistics are calculated by the server.

  


  One option is to log the statistics for each ts file that is requested,
but the video buffering by the player means that these statistics are always wrong,
the player may buffer 10 minutes but the user still watches 1 minute.

  


  Any suggestion or experience

  


  I used vediojs and I know that I can send the watching time from the client to the server and record it.

  


  But We are sure that this method is not accurate and the user can change the statistics.