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• 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

  


  


• Ffmpeg error splitting into individual encoded frames

  19 avril 2021, par Vainmonde De Courtenay

  I have a folder of .png images I wanted to make a series of .h264 frames (one frame per .png). The frames are named frame001.png, frame002.png, ...

  


  First inside the folder containing the .png files I ran

  


  ffmpeg -r 10 -i frame%3d.png -codec libx264 -r 10 video.h264 -y


  


  which did its job, generating one video.h264. But now I want to divide that into many smaller .h264 files. Following this advice I tried

  


  ffmpeg -i video.h264 -f image2 -vcodec copy -bsf h264_mp4toannexb frame%03d.h264


  


  but I hit error

  


  [image2 @ 0x55d2fc1f7b20] Application provided invalid, non monotonically increasing dts to muxer in stream 0: -2 >= -2


  


  Full console debug :

  


  # ffmpeg -i video.h264 -f image2 -vcodec copy -bsf h264_mp4toannexb fr%03d.h264
ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, h264, from 'video.h264':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p(progressive), 480x852, 10 fps, 10 tbr, 1200k tbn, 20 tbc
Output #0, image2, to 'fr%03d.h264':
  Metadata:
    encoder         : Lavf57.83.100
    Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p(progressive), 480x852, q=2-31, 10 fps, 10 tbr, 10 tbn, 10 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[image2 @ 0x55d2fc1f7b20] Application provided invalid, non monotonically increasing dts to muxer in stream 0: -2 >= -2
frame=   28 fps=0.0 q=-1.0 Lsize=N/A time=00:00:02.50 bitrate=N/A speed=1.58e+03x    
video:142kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown


  


  I have tried the problem with multiple videos and the same thing. In fact when I check, the new files do appear. But they aren't really .h264's (just a few bytes large - appear to be ghost files) and I'm guessing this is down to the error displayed above.