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• avformat/matroskaenc : Fix memleak upon failure

  16 octobre 2019, par Andreas Rheinhardt

  avformat/matroskaenc : Fix memleak upon failure
  The Matroska muxer up until now leaked memory in two scenarios :
  1. If an error happened during writing the trailer, as
  
  mkv_write_trailer() returned early without cleaning up.
  
  2. If mkv_write_header() indicated success despite an error in the
  
  underlying AVIOContext. In this case avformat_write_header() returned
  
  the IO error and according to the API the caller is not allowed to call
  
  av_write_trailer(), so that no cleanup happened for the allocations made
  
  in mkv_write_header().
  This has been fixed by using a dedicated deinit function.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/matroskaenc.c

• Filter complex with split source and multiple overlays : Can my code be simplified ?

  29 juin 2024, par Patrick Hennessey

  I've created a complex split filter that splits a single 1372 x 1372 input source into multiple uniquely shaped and cropped slices (s1, s2, etc), and overlays them on a padded background plate into a single output. It also applies a 20fps target framerate on the last overlay step.

  


  It works exactly how I want, but I'm wondering if this code is inefficient or redundant in any way :

  


  ffmpeg -i test.mp4 -filter_complex "[0:v]split=5[s1][s2][s3][s4][s5];
[s1]scale=377:377,crop=360:360:2:2,pad=1920:1080:1560:720[bg];
[s2]crop=1372:1068:0:0[s2];[bg][s2]overlay=0:0[bg];
[s3]crop=460:308:0:1064[s3];[bg][s3]overlay=1372:0[bg];
[s4]crop=460:308:456:1064[s4];[bg][s4]overlay=1372:308[bg];
[s5]crop=460:308:912:1064[s5];[bg][s5]overlay=1372:616,fps=20" output.mp4


  


  Is there a more elegant way to achieve the same result ?

  


• Converting stereo file to mono but preserving peak and RMS loudness

  14 juin 2020, par user319249

  I am converting stereo audio files to mono using ffmpeg.

  



  ffmpeg -i $1 -ac 1 -ab 192k mono_$1


  



  However, after conversion, the RMS and peak loudness levels are not the same.

  



  Tests-iMac:auditions test$ ./rms.sh mono_test.mp3 
 mean_volume: -20.1 dB
 max_volume: -0.2 dB
 Peak level dB: -0.150201
 RMS level dB: -20.138039
 RMS peak dB: -10.650649
 RMS trough dB: -94.923318
 Flat factor: 0.000000
 Peak count: 2.000000
 Bit depth: 32/32
 Number of samples: 5800320
 Number of NaNs: 0.000000
 Number of Infs: 0.000000
 Number of denormals: 0.000000
Tests-iMac:auditions test$ ./rms.sh test.mp3 
 mean_volume: -22.9 dB
 max_volume: -2.9 dB
 Peak level dB: -2.896314
 RMS level dB: -22.883812
 RMS peak dB: -13.397327
 RMS trough dB: -95.943631
 Flat factor: 0.000000
 Peak count: 2.000000
 Bit depth: 32/32
 Number of samples: 5800320
 Number of NaNs: 0.000000
 Number of Infs: 0.000000
 Number of denormals: 0.000000


  



  The first ouput is the mono file which is technically louder than the stereo file, listed second. How can I preserve the peak and RMS values while also converting to mono ? I have no issue scripting in order to obtain the stereo loudness values to pass to the mono conversion process.

  



  Thanks !