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• Using ffmpeg to extract webvtt (SRT) subtitles

  4 mars 2021, par user15332104

  I am trying to extract SRT subtitles from the movies online with use of ffmpeg.
Unfortunately transmission drops after some segments, and there is no output SRT file

  


  Any advice which switch use ? Anything else than ffmpeg would serve the purpose here ?

  


  ffmpeg -i "https://rts-vod-amd.akamaized.net/ch/hls/11997514/8f3c162a-6224-3cac-8f47-788ef9fd24dc/index-f7.m3u8" -scodec srt berry_subs.srt

  


  (Actual movie : https://www.rts.ch/play/tv/telefilm/video/meurtres-en-berry?urn=urn:rts:video:11997514)

  


  ffmpeg -i "https://rts-vod-amd.akamaized.net/ch/hls/12003885/cd6616a8-b1bc-39f8-b900-53ab628eba9e/index-f7.m3u8" -scodec srt mlh_subs.srt

  


  (Actual movie : https://www.rts.ch/play/tv/telefilm/video/meurtres-a-mulhouse?urn=urn:rts:video:12003885 )

  


• Mjpeg recording with FFMPEG preserving time information

  14 septembre 2012, par Muhammad Adeel Zahid

  I am recording the MJPEG video from an IP camera and saving it to a file but the problem is that file's duration is way smaller than the actual recording time. Its around 9 seconds video for 2 minutes recording. I tried following commands in order

  ffmpeg -f mjpeg -r 8 -i http://c-cam.uchicago.edu/mjpg/video.mjpg -vcodec mpeg4 -b 1000000 -r 8 video_file.avi 

  Then I omitted the most of the flags and tried like this

  ffmpeg -f mjpeg -i http://c-cam.uchicago.edu/mjpg/video.mjpg video_file.avi

  But the problem is that the duration of recorded file is 9 seconds where as the actual recording time is around 2 minutes. I finally tried setpts filter that is supposed to insert the timestamps. The command is as follows

  ffmpeg -f mjpeg -i http://c-cam.uchicago.edu/mjpg/video.mjpg -vf "setpts=1*PTS" video_file.avi

  But result was still the same. Recording time was way more than video duration. How can I add presentational time stamps when recording from mjpeg source using ffmpeg ?

• Revert "rtpenc_chain : Don’t copy the time_base back to the caller"

  29 mai 2014, par Martin Storsjö

  Revert "rtpenc_chain : Don’t copy the time_base back to the caller"
  While it strictly isn’t necessary to copy the time base (since
  
  any use of it is scaled in ff_write_chained), it still is better
  
  to signal the actual time base to the caller, avoiding one
  
  unnecessary rescaling. This also lets the caller know what the
  
  actual internal time base is, in case that is useful info
  
  for some caller.
  This reverts commit 397ffde115f4e0482a007b672f40457596cebfc4.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/rtpenc_chain.c