通過使用FFmpeg合併2個mp3文件

Question

我需要通過使用ffMpeg合併兩個mp3文件。
我用這個代碼，但它不工作

我想執行這個

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

爲什麼我的代碼工作？

和我的完整輸出日誌，問題不明編碼器「了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! 

Answer 1

MP3編碼器

的FFmpeg沒有一個本地的MP3編碼器，所以你必須使用一個外部庫（了libmp3lame或libshine ）支持MP3編碼。但是，您的ffmpeg版本未編譯爲--enable-libmp3lame或--enable-libshine。您將不得不重新編譯ffmpeg。

libmp3lame比較常見，但libshine用於定點MP3編碼，這可能在您的ARM設備上更快（但我從未執行任何比較）。

amerge

你的命令使用amerge過濾合併兩個立體聲音頻文件。這將導致4聲道輸出。如果要將輸出縮混爲立體聲，請添加-ac 2。