Ticket will be created on https://roundup.ffmpeg.org/

Summary :
=====================
Output movie after sound resampling has a wrong duration and the sound is played in slow motion (video is ok).

Files :
=====================
sample_before_resampling.avi (Sample file)
example_after_resampling.avi (Example of bogus file after resampling)

Examples of commands to reproduce :
=====================
ffmpeg -i sample_before_resampling.avi -f avi -vcodec copy -acodec libfaac test_slow_1.avi
ffmpeg -i sample_before_resampling.avi -f avi -vcodec copy -acodec libmp3lame test_slow_2.avi

Proof :
=====================
$ ffmpeg -i slow_sound_after_sound_resampling.avi 2>&1 | grep Duration
  Duration: 00:00:06.77, start: 0.000000, bitrate: 3825 kb/s
  
$ ffmpeg -i test_slow_1.avi 2>&1 | grep Duration
  Duration: 00:00:13.24, start: 0.000000, bitrate: 1908 kb/s
  
$ ffmpeg -i test_slow_2.avi 2>&1 | grep Duration
  Duration: 00:00:13.36, start: 0.000000, bitrate: 1911 kb/s

Notes :
=====================
I tried a variety of formats (avi,flv,mp4) and codecs, but it always bugs.

Apologies :
=====================
Please accept my apologies for the kind of sample I provide you...
Thank you to consider it like any other sample.

Contact :
=====================
mcflick181@gmail.com