【问题标题】：Combine 2 mp3 files by using FFmpeg使用 FFmpeg 合并 2 个 mp3 文件
【发布时间】：2015-12-28 14:56:32
【问题描述】：

我需要使用 ffMpeg 合并两个 mp3 文件。
我使用这个代码，但它不起作用

我想执行这个

ffmpeg -i input1.mp3 -i input2.mp3 -filter_complex amerge -c:a libmp3lame -q:a 4 output.mp3

为什么我的代码不起作用？

还有我完整的输出日志，问题 Unknown encoder 'libmp3lame'

        01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   built on Oct  7 2014 15:05:17 with gcc 4.8 (GCC)
01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libavutil      54.  7.100 / 54.  7.100
01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libavcodec     56.  1.100 / 56.  1.100
01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libavformat    56.  4.101 / 56.  4.101
01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libavdevice    56.  0.100 / 56.  0.100
01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libavfilter     5.  1.100 /  5.  1.100
01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libswscale      3.  0.100 /  3.  0.100
01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libswresample   1.  1.100 /  1.  1.100
01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libpostproc    53.  0.100 / 53.  0.100
01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout Input #0, mp3, from '/storage/emulated/0/a.mp3':
01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   Metadata:
01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     title           : Creep
01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     album           : Pablo Honey
01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     track           : 2/13
01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     disc            : 1/1
01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     artist          : Radiohead
01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     genre           : Alternative
-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     publisher       : EMI Music Distribution
-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     album_artist    : Radiohead
01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     composer        : Colin Greenwood/Ed O'Brien/Jonny Greenwood/Phil Selway/Thom Yorke
01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     date            : 1993
01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   Duration: 00:03:55.91, start: 0.025057, bitrate: 320 kb/s
01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
01-06 11:48:13.573 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     Metadata:
01-06 11:48:13.573 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout       encoder         : LAME3.97 
01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout [mp3 @ 0x2b403a90] Estimating duration from bitrate, this may be inaccurate
01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout Input #1, mp3, from '/storage/emulated/0/b.mp3':
01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   Metadata:
01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     title           : This is Love                  
01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     artist          : Chirs de Burgh                
01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     album           : This Way Up                   
01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     date            : 1994
01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     comment         :                               
01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   Duration: 00:03:47.67, start: 0.000000, bitrate: 128 kb/s
01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
01-06 11:48:13.579 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout Unknown encoder 'libmp3lame'
01-06 11:48:13.580 6119-6473/com.uraroji.garage.android.mp3recvoice D/dalvikvm: threadid=14: exiting
01-06 11:48:13.580 6119-6473/com.uraroji.garage.android.mp3recvoice D/dalvikvm: threadid=14: bye!
01-06 11:48:13.580 6119-6119/com.uraroji.garage.android.mp3recvoice D/test: processComplete 1
01-06 11:48:13.580 6119-6472/com.uraroji.garage.android.mp3recvoice D/dalvikvm: threadid=13: exiting
01-06 11:48:13.581 6119-6472/com.uraroji.garage.android.mp3recvoice D/dalvikvm: threadid=13: bye!

【问题讨论】：

尝试删除要添加的字符串中的所有空格
你能提供任何实际的错误信息吗？您可能应该添加-ac 2 输出选项以缩混为立体声，否则如果您在两个立体声输入上使用amerge，您最终可能会得到一个4 声道输出。
@LordNeckbeard 错误消息：无法为 'ffmpeg' 找到合适的输出格式，ffmpeg：参数无效
@LordNeckbeard 以及当用 -y 替换 ffmpeg 并附加 -ac 2 时返回此错误未知编码器 libmp3kame
您应该显示 complete 输出/日志。没有名为 libmp3kame 的编码器。你有错字吗？

标签： android audio ffmpeg mp3

【解决方案1】：

MP3 编码器

FFmpeg 没有原生 MP3 编码器，因此您必须使用外部库（libmp3lame 或 libshine）来支持 MP3 编码。但是，您的 ffmpeg 构建未使用 --enable-libmp3lame 或 --enable-libshine 编译。你将不得不重新编译ffmpeg。

libmp3lame 更常见，但 libshine 用于定点 MP3 编码，在您的 ARM 设备上可能更快（但我从未进行过任何比较）。

合并

您的命令使用amerge 过滤器来合并两个立体声音频文件。这将产生一个 4 通道输出。如果您想将输出缩混为立体声，请添加-ac 2。

【讨论】：