ffmpeg -i input.mkv -map 0:2 -c copy -strict -2 audio.mkv
嗨，我有上面的命令。输出显示有2个音频流。我只想复制ac3音频（实际上我想转换它，但即使此复制也不起作用）。我在有元数据的地方截断了输出图片
具有完整日志的新更新示例，导致出现相同消息
ffmpeg -i input.mka -map 0:0 -c:a libfdk_aac aac_out.m4a
ffmpeg version 2.7.1 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.9.3 (crosstool-NG 1.20.0) 20150311 (prerelease)
configuration: --prefix=/usr --incdir='${prefix}/include/ffmpeg' --arch=i686 --target-os=linux --cross-prefix=/usr/local/x86_64-pc-linux-gnu/bin/x86_64-pc-linux-gnu- --enable-cross-compile --enable-optimizations --enable-pic --enable-gpl --enable-shared --disable-static --enable-version3 --enable-nonfree --enable-libfaac --enable-encoders --enable-pthreads --disable-bzlib --disable-protocol=rtp --disable-muxer=image2 --disable-muxer=image2pipe --disable-swscale-alpha --disable-ffserver --disable-ffplay --disable-devices --disable-bzlib --disable-altivec --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libmp3lame --disable-vaapi --disable-decoder=amrnb --disable-decoder=ac3 --disable-decoder=ac3_fixed --disable-encoder=zmbv --disable-encoder=dca --disable-encoder=ac3 --disable-encoder=ac3_fixed --disable-encoder=eac3 --disable-decoder=dca --disable-decoder=eac3 --disable-decoder=truehd --cc=/usr/local/x86_64-pc-linux-gnu/bin/x86_64-pc-linux-gnu-ccache-gcc --enable-yasm --enable-libx264 --enable-encoder=libx264
libavutil 54. 27.100 / 54. 27.100
libavcodec 56. 41.100 / 56. 41.100
libavformat 56. 36.100 / 56. 36.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 16.101 / 5. 16.101
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.100 / 1. 2.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, matroska,webm, from '/volume1/..../input.mka':
Metadata:
encoder : libebml v1.3.9 + libmatroska v1.5.2
creation_time : 2019-07-07 06:19:20
Duration: 02:29:21.98, start: 0.000000, bitrate: 640 kb/s
Stream #0:0(eng): Audio: ac3, 48000 Hz, 5.1(side), 640 kb/s
Metadata:
BPS-eng : 640000
DURATION-eng : 02:29:21.984000480
NUMBER_OF_FRAMES-eng: 280062
NUMBER_OF_BYTES-eng: 716958720
_STATISTICS_WRITING_APP-eng: mkvmerge v35.0.0 ('All The Love In The World') 64-bit
_STATISTICS_WRITING_DATE_UTC-eng: 2019-07-07 06:19:20
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Output #0, ipod, to 'aac_out.m4a':
Metadata:
encoder : libebml v1.3.9 + libmatroska v1.5.2
Output file #0 does not contain any stream