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• avcodec/dvdsubdec, dvbsubdec : remove bitmap dumping in DEBUG builds

  28 mai 2022, par softworkz

  avcodec/dvdsubdec, dvbsubdec : remove bitmap dumping in DEBUG builds
  It's been a regular annoyance and often undesired.
  
  There will be a subtitle filter which allows to dump individual
  
  subtitle bitmaps.
  Signed-off-by : softworkz <softworkz@hotmail.com>
  
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavcodec/dvbsubdec.c
  • [DH] libavcodec/dvdsubdec.c

• Merging input Streams with nodejs/ffmpeg

  14 septembre 2020, par jAndy

  I'm creating a very basic and rudimentary Video-Web-Chat. On the client side, I'm going to use a simple getUserMedia API call to capture the webcam data and send video-data as data-blob to my server.

  


  From There, I'm planning to either use the fluent-ffmpeg library or just spawn ffmpeg myself and pipe that raw data to ffmpeg, which in turn, does some magic and pushes that out as HLS stream to an Amazon AWS Service (for instance), which then gets actually displayed on a Web Browser for all participating people in the video chat.

  


  So far, I think all of this should be fairly easy to implement, but I keep my head spinning around the question, how I can create a "combined" or "merged" frame and stream, so the output HLS data from my server to the distributing cloud service has only to be one combined data stream to receive.

  


  If there are 3 people in that video chat, my server receives 3 data streams from those clients and combines these data streams (from the individual web-cam data sources) into one output stream.

  


  How could that be accomplished ?
Can I "create" a new frame with ffmpeg, so to speak ? I would be very thankful if anybody could give me a heads up here, maybe I'm thinking in a complete wrong direction.

  


  Another question which arises to me is, if I really can just "dump" any data, which I'm receiving from a binary blob created from getUserMedia or MultiStreamRecorder to ffmpeg or if I have to specify somewhere and somehow the exact codecs being used etc.?

  


• output of ffmpeg comes out like yamborghini high music video

  19 janvier, par chip

  I do this procedure when I edit a long video

  


  

  • segment to 3 second videos, so I come up with a lot of short videos

  


  • I randomly pick videos and put them in a list

  


  • then I join these short videos together using concat

  


  • now I get a long video again. next thing I do is segment the video 4 minute videos

  


  


  After processing, the videos look messed up. I don't know how to describe it but it looks like the music video yamborghini high

  


  For some reason, this only happens to videos I capture at night. I do the same process for day time footage, no problem.

  


  is there a problem with slicing, merging and then slicing again ?

  


  or is it an issue that I run multiple ffmpeg scripts at the same time ?

  


  here's the script

  


  for FILE in *.mp4; do ffmpeg -i ${FILE} -vcodec copy -f segment -segment_time 00:10 -reset_timestamps 1 "part_$( date '+%F%H%M%S' )_%02d.mp4"; rm -rf $FILE; done; echo 'slicing completed.' && \ 
for f in part_*[13579].mp4; do echo "file '$f'" >> mylist.txt; done
ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4 && echo 'done merging.' && \ 
ffmpeg -i output.mp4 -threads 7 -vcodec copy -f segment -segment_time 04:00 -reset_timestamps 1 "Video_Title_$( date '+%F%H%M%S' ).mp4" && echo 'individual videos created'