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• Conversion of individual mp4 files to ts yields unexpected playback

  3 août 2021, par MorenoGentili

  I'm converting three mp4 files (h264, no audio, each with a duration of three seconds) to the mpeg-ts format like so.

  


  ffmpeg -i 1.mp4 -c copy 1.ts
ffmpeg -i 2.mp4 -c copy 2.ts
ffmpeg -i 3.mp4 -c copy 3.ts


  


  Please note : I can't combine the mp4 files beforehand. Each one has to be converted individually as shown above since they're being generated by a live recorder.

  


  Then, I manually created a .m3u8 manifest like this one, so I could play those 3 ts files in sequence :

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-TARGETDURATION:3
#EXTINF:3,
1.ts
#EXTINF:3,
2.ts
#EXTINF:3,
3.ts
#EXT-X-ENDLIST


  


  When I run the ffplay index.m3u8 command :

  


  

  • 1.ts is played for three seconds as expected ;

  


  • 2.ts is played "for a split second" (maybe just a frame) ;

  


  • 3.ts is played for three seconds as expected.

  


  


  Can someone explain why 2.ts is shown for such a brief time ? When I run ffmpeg -i 2.ts, the output is correctly displaying a duration of three seconds.

  


  Input #0, mpegts, from '2.ts':
  Duration: 00:00:03.00, start: 1.480000, bitrate: 49 kb/s


  


  How can I change my mp4 -> ts conversion commands so that each file can play for their whole duration (i.e. three seconds each) ? I'd like to avoid reencoding if possible.

  


  Thank you, I'm adding a link to the three files and the manifest for completeness.

  


• FFMPEG segmented radio stream shows incorrect duration after a concat

  27 juillet 2021, par darbid

  On MacOS using Automator I am recording a radio stream. I thought the best way to do this so as to avoid an internet drop out was to segment it as follows.

  


  /opt/homebrew/Cellar/ffmpeg/4.4_2/bin/ffmpeg -i http://s2.viastreaming.net:7100 -t 02:10:00 -c copy -f segment -segment_time 1800 -segment_list /Volumes/BackUp/Radio/segmentlist.txt -segment_list_entry_prefix "file /Volumes/BackUp/Radio/" /Volumes/BackUp/Radio/Segments_%d.m4a


  


  I then bring it all together with the following command.

  


  /opt/homebrew/Cellar/ffmpeg/4.4_2/bin/ffmpeg -f concat -safe 0 -i /Volumes/BackUp/Radio/segmentlist.txt -c copy /Volumes/BackUp/Radio/capture.m4a


  


  Looking at the get info of the capture.m4a file it shows a duration of 2 hours 10 minutes, however, when I play it in for example iTunes it shows exactly 5:10. It also shows 5:10 for example in Emby (a local media server solution).

  


  Can someone please point me in the right direction on fixing my ffmpeg commands ?

  


• Java process use more memory than VisualVM shows

  16 juillet 2021, par Dinexpod

  my java application works 1 day,
(I use different libs for processing photo like ffmpeg, javacv, javacpp)
and then I see that my app use 9,5Gb RAM.

  


  system monitoring tools

  


  I don't understand why my app use so a lot of memory.

  


  I set -Xmx6G

  


  In VisualVM I see that heap space size 188M

  


  heap space in visualVM

  


  Meta Space use 141M

  


  metaspace in visualVM

  


  May be this helps

  


  allocated bytes in visualVM

  


  I read articles that Java use more RAM than heap space because there are JIT, Heap space, meta space, code, ant etc. But 9.5Gb is a lot of on my mind

  


  Edited :

  


  

  • Yes my app some times have exceptions java.lang.OutOfMemoryError : Java heap space