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• Trying to get frame timestamp with ffmpeg from a RTSP camera

  12 juin 2022, par jaygzixst

  I'm trying to retrieve the timestamp of each frame of a camera using an rstp stream and them.
For recording I use the following command line and it's work :

  


  ffmpeg
-correct_ts_overflow 0
-probesize 1G
-analyzeduration 1G
-i rtsp://user:password@ip:port
-vcodec copy
-bsf:v h264_mp4toannexb
-bufsize 10M
-acodec copy
-f ssegment
-segment_list_flags live
-segment_atclocktime 1
-reset_timestamps 1
-write_empty_segments 1
-segment_time 15
-segment_list C:\Video\Delivery\ffmpeg\list.video
-segment_list_type csv
-strftime 1 "C:\Video\Delivery\ffmpeg\%%Y%%m%%d_%%H-%%M-%%S.ts"


  


  And for some utility I would like to be able to retrieve the timestamp of the machine when I receive a frame, so by searching a bit I found different post on '-mkvtimestamp_v2'. By trying it alone with the camera as if below :

  


  ffmpeg
-copyts ^
-correct_ts_overflow 0 ^
-probesize 1G ^
-analyzeduration 1G ^
-i rtsp://user:password@ip:port
-c copy
-pix_fmt yuv420p
-flush_packets 1
-vframes 10
-reset_timestamps 1
-timestamp now
-copyts
-f mkvtimestamp_v2 timestamp.txt
-vsync 0


  


  It works perfectly.

  


  But from the moment I try to record AND try to retrieve the timestamp simultaneously with the following command :

  


  ffmpeg
-use_wallclock_as_timestamps 1
-correct_ts_overflow 0
-probesize 1G
-analyzeduration 1G
-i rtsp://user:password@ip:port
-vcodec copy
-bsf:v h264_mp4toannexb
-bufsize 10M
-acodec copy
-f ssegment
-segment_list_flags live
-segment_atclocktime 1
-reset_timestamps 1
-write_empty_segments 1
-segment_time 15
-segment_list C:\Video\Delivery\ffmpeg\list.video
-segment_list_type csv
-strftime 1 "C:\Video\Delivery\ffmpeg\%%Y%%m%%d_%%H-%%M-%%S.ts"
-copyts
-vcodec copy
-flush_packets 1
-f mkvtimestamp_v2 log.txt
-vsync 0


  


  I get a lot of : Non-monotonous DTS in output stream 0:0 warning.
I also have on average one minute delay between the recorded timestamps, and the real timestamp.
And the first video recorded have a bugged timer on a video player like this : Here

  


  I've tried arranging the command in different orders but I get nothing conclusive...

  


  So if you have any idea that would be a big help !

  


  I work on Windows 10 and I use ffmpeg-3.4.1.

  


  Cordially,

  


  Jay

  


• Evolution #2614 (Nouveau) : Améliorer la selection des mots-clés Spip 3

  25 mars 2012, par YannX spip

  Dans l’interface de saisie des mots-clés, il devient rapidement difficile de s’y retrouver quand a a saisir parmi un grand nombre de mots-clés (l’exemple caractéristique en est Spip-Contrib...). Une première amélioration pourrait consister à rafraichir le nombre de mots déjà sélectionnés dans le (...)

• Double subtitles when hardcoding from .mkv container

  4 novembre 2022, par Goran Hinic

  I'm trying to hardcode subtitles into a file that's in .mkv container, using one of the subtitle strams from the container. I want subtitles to have a black background on them. I'm also trying to keep 10bit encoding and preserve high quiality. Result is ok, except that all subtitles are doubled. So there is a layer of good subtitles in white on black background, and also, half of the font size down, same subtitles in black. Can someone point out the issue with my command ?
Thank you.

  


  Ran this command :

  


  


  ffmpeg -i movie.mkv -vf "subtitles=movie.mkv:si=0:force_style='OutlineColour=&000000000,BorderStyle=3,Outline=3,Shadow=0,MarginV=20'" -c:v libx265 -crf 23 -preset slow -x265-params profile=main10 -c:a copy movie_subs.mkv

  


  


  Expected : White subtitles on black background
Actual : White subtitles on black background with black subtitles half font size down