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• corrupted video after concat parts of captured RTSP stream with FFMPEG

  11 décembre 2022, par 555Russich

  Target : capture rtsp stream with sound from intercom camera and save it as 1hour duration video

  


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  URL for rtsp stream is updаting every 2 minutes, but i need to get parts with 1hour duration. So i see only solution to concatenate 2 minutes videos. It's required time between capturing stream parts to get response from server and reconnect with another url

  


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  First i tried opencv. It's not working with sound

  


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  Then i started using ffmpeg :

  


  Capturing stream :

  


  ffmpeg -rtsp_transport tcp -i  2min_part.mp4


  


  Concatenating :

  


  ffmpeg -safe 0 -f concat -i parts_list.txt -c copy concatenated_1.mp4


  


  in stdout getting Non-monotonous DTS in output stream :

  


  [mp4 @ 0x560c12d80bc0] Non-monotonous DTS in output stream 0:0; previous: 57400952, current: 41462297; changing to 57400953. This may result in incorrect timestamps in the output file.
[mp4 @ 0x560c12d80bc0] Non-monotonous DTS in output stream 0:0; previous: 57400953, current: 41462809; changing to 57400954. This may result in incorrect timestamps in the output file.
[mp4 @ 0x560c12d80bc0] Non-monotonous DTS in output stream 0:0; previous: 57400954, current: 41463321; changing to 57400955. This may result in incorrect timestamps in the output file.
...


  


  After opening video in media players i see that from one second video is stopped, but sound is going on. Interesting part that with every new opening this second (starting from video stops) changes

  


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  Then i tried this solution :

  


  ffmpeg -safe 0 -f concat -segment_time_metadata 1 -i parts_list.txt -vf select=concatdec_select -af aselect=concatdec_select,aresample=async=1 concatenated_2.mp4


  


  No Non-monotonous DTS wаrnings, but video is still corrupted like first. Also this solution requires a lot of CPU while first concatenating method is very fast.

  


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  Question : How to do concatenating and get not corrupted video ? May be i need to configure capturing options to simply use concatenating with -c copy ?

  


  parts of videos and concatenated

  


  using exiftool concatenated_1.mp4 i see that :

  


  Duration                        : 1:17:44
Track Duration                  : 1:17:44
Media Duration                  : 0:53:59


  


• is there a way to auto trim parts of my video when a specefic color or text shows up on those parts

  10 novembre 2022, par Yousif K Al Ameen 1

  I play a game and record it, but unfortunately many parts of that recording is when my internet connection gets lost for several seconds. During that period it only shows a text that says "connection lost". Then the game resumes normally in few seconds after the connection is back.
Is there a software or a way that allows me to auto trim these connection lost periods from my viedeo ? Please help I need to trim a lot of these periods so that I can post cool gaming videos online without the "connection lost" scenes included.

  


  I tried searching on youtube and found some ffmpeg, python, and opencv methods but none of which is suitabal or easy to apply for my situation

  


• avcodec/mpeg12enc : Don't initialize unused parts of RLTable

  22 octobre 2022, par Andreas Rheinhardt

  avcodec/mpeg12enc : Don't initialize unused parts of RLTable
  ff_rl_init() initializes RLTable.(max_level|max_run|index_run) ;
  
  max_run is unused by the MPEG-1/2 encoders (as well as SpeedHQ).
  
  Furthermore, it initializes these things twice (for two passes),
  
  but the second half of this is never used.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpeg12enc.c