id	summary	reporter	owner	description	type	status	priority	component	version	resolution	keywords	cc	blockedby	blocking	reproduced	analyzed
720	Volume filter does not work	jeremysalwen		"What you were trying to accomplish: 

Test a libavfilter filter in ffmpeg.

The problem you encountered:

the libavfilter filter ""volume"" had no effect on the audio.

Console output:

$ ./ffmpeg -v 9 -loglevel 99 -i ~/write.wav -vf volume=0.1 ~/lol.wav 
ffmpeg version N-35540-g0cc9949, Copyright (c) 2000-2011 the FFmpeg developers
  built on Dec  7 2011 22:26:02 with gcc 4.6.1
  configuration: --enable-filter=earwax
  libavutil    51. 30. 0 / 51. 30. 0
  libavcodec   53. 41. 2 / 53. 41. 2
  libavformat  53. 24. 0 / 53. 24. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 51. 0 /  2. 51. 0
  libswscale    2.  1. 0 /  2.  1. 0
[wav @ 0x2f857e0] Format wav probed with size=2048 and score=99
[pcm_s16le @ 0x2f8bc00] err{or,}_recognition separate: 1; 1
[pcm_s16le @ 0x2f8bc00] err{or,}_recognition combined: 1; 65537
[wav @ 0x2f857e0] parser not found for codec pcm_s16le, packets or times may be invalid.
[wav @ 0x2f857e0] max_analyze_duration 5000000 reached at 5015510
Input #0, wav, from '/home/jeremy/write.wav':
  Duration: 00:04:01.86, bitrate: 1411 kb/s
    Stream #0:0, 218, 1/44100: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s
[pcm_s16le @ 0x302d0e0] err{or,}_recognition separate: 1; 1
[pcm_s16le @ 0x302d0e0] err{or,}_recognition combined: 1; 65537
[pcm_s16le @ 0x2f8bc00] err{or,}_recognition separate: 1; 65537
[pcm_s16le @ 0x2f8bc00] err{or,}_recognition combined: 1; 65537
Output #0, wav, to '/home/jeremy/lol.wav':
  Metadata:
    encoder         : Lavf53.24.0
    Stream #0:0, 0, 1/44100: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le -> pcm_s16le)
Press [q] to stop, [?] for help
size=   41665kB time=00:04:01.86 bitrate=1411.2kbits/s    
video:0kB audio:41665kB global headers:0kB muxing overhead 0.000108%
"	defect	closed	normal	avfilter	git-master	invalid					1	1