Я пытаюсь добавить эффект затухания к звуку, используя фильтр afade .
Аудио изначально 3:30 по времени, но после выполнения этой команды:
ffmpeg -i adele.mp3 -af "afade=t=in:ss=0:d=15" test.mp3
стало 8:01 .
Вот полный след журналов:
ffmpeg version N-60332-ga0d5204 Copyright (c) 2000-2014 the FFmpeg developers
built on Feb 4 2014 21:31:51 with Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
configuration: --prefix=/usr/local --enable-gpl --enable-nonfree --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid
libavutil 52. 63.100 / 52. 63.100
libavcodec 55. 49.101 / 55. 49.101
libavformat 55. 29.101 / 55. 29.101
libavdevice 55. 7.100 / 55. 7.100
libavfilter 4. 1.102 / 4. 1.102
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
Input #0, mp3, from 'adele.mp3':
Metadata:
title : Chasing Pavements
artist : Adele
track : 3
album : 19 (Deluxe Edition)
date : 2008
Duration: 00:03:30.55, start: 0.025056, bitrate: 160 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 159 kb/s
Stream #0:1: Video: mjpeg, yuvj420p(pc), 600x600 [SAR 72:72 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
Metadata:
title :
comment : Other
File 'test.mp3' already exists. Overwrite ? [y/N] y
[swscaler @ 0x7fbec4801c00] deprecated pixel format used, make sure you did set range correctly
[mp3 @ 0x7fbec301f400] Frame rate very high for a muxer not efficiently supporting it.
Please consider specifying a lower framerate, a different muxer or -vsync 2
Output #0, mp3, to 'test.mp3':
Metadata:
TIT2 : Chasing Pavements
TPE1 : Adele
TRCK : 3
TALB : 19 (Deluxe Edition)
TLAN : English
TDRL : 2008
TSSE : Lavf55.29.101
Stream #0:0: Video: png, rgb24, 600x600 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 90k tbn, 90k tbc
Metadata:
title :
comment : Other
Stream #0:1: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p
Stream mapping:
Stream #0:1 -> #0:0 (mjpeg -> png)
Stream #0:0 -> #0:1 (mp3 -> libmp3lame)
Press [q] to stop, [?] for help
[libmp3lame @ 0x7fbec300cc00] Trying to remove 1152 samples, but the queue is empty
frame= 1 fps=0.2 q=0.0 Lsize= 3521kB time=00:03:30.54 bitrate= 137.0kbits/s
video:230kB audio:3290kB subtitle:0 data:0 global headers:0kB muxing overhead 0.010403%