我有一个包含8个单声道音频流的MOV文件，可能是5.1或7.1设置。我想从中生成一个for-web预览FLV文件，但这样做会失去对话中的声音。 FFmpeg可能偏向于没有声音的八个音频流。当我研究合并音频流的方法时，为了恢复声音，我失去了完全执行我的ffmpeg命令的能力。这是我现在所拥有的（引入“-map 0”选项使命令不可执行）
/usr/local/bin/ffmpeg -i ../vmx_files/6711177.mov -map 0 -y -f flv -qmax 10
-vf "scale=trunc(oh*a/2)*2:720" -ar 44100 -ab 64k assets/flv/6711177.flv
ffmpeg version N-69160-g1013c15 Copyright (c) 2000-2015 the FFmpeg developers
built on Jan 20 2015 09:41:10 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-11)
configuration:
libavutil 54. 17.100 / 54. 17.100
libavcodec 56. 20.100 / 56. 20.100
libavformat 56. 19.100 / 56. 19.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 8.100 / 5. 8.100
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../vmx_files/6711177.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2015-11-24 23:00:27
Duration: 00:01:48.34, start: 0.000000, bitrate: 229443 kb/s
Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709), 1920x1080, 220043 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 2997 tbn, 2997 tbc (default)
Metadata:
creation_time : 2015-11-24 23:00:27
handler_name : Apple Alias Data Handler
encoder : Apple ProRes 422 (HQ)
timecode : 00:59:50;00
Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
Metadata:
creation_time : 2015-11-24 23:00:27
handler_name : Apple Alias Data Handler
Stream #0:2(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
Metadata:
creation_time : 2015-11-24 23:00:27
handler_name : Apple Alias Data Handler
Stream #0:3(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
Metadata:
creation_time : 2015-11-24 23:00:27
handler_name : Apple Alias Data Handler
Stream #0:4(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
Metadata:
creation_time : 2015-11-24 23:00:27
handler_name : Apple Alias Data Handler
Stream #0:5(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
Metadata:
creation_time : 2015-11-24 23:00:27
handler_name : Apple Alias Data Handler
Stream #0:6(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
Metadata:
creation_time : 2015-11-24 23:00:27
handler_name : Apple Alias Data Handler
Stream #0:7(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
Metadata:
creation_time : 2015-11-24 23:00:27
handler_name : Apple Alias Data Handler
Stream #0:8(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
Metadata:
creation_time : 2015-11-24 23:00:28
handler_name : Apple Alias Data Handler
Stream #0:9(eng): Data: none (tmcd / 0x64636D74)
Metadata:
rotate : -0
creation_time : 2015-11-24 23:03:22
handler_name : Apple Alias Data Handler
timecode : 00:59:50;00
Data stream encoding not supported yet (only streamcopy)