ffmpeg 转换命令

ffmpeg -i ../../dalei.mp3 -i ../../guodu.mp3  -filter_complex amix=inputs=2:duration=first:dropout_transition=2 ../../daleiguodu.wav

ffmpeg -i ../../dalei.mp3 -i ../../xiayu.mp3  -filter_complex amix=inputs=2:duration=first:dropout_transition=2 ../../daleixiayu.wav

ffmpeg -i ../../dianhua.mp3  -f s16le -ar 16000 -acodec pcm_s16le -ac 2  ../../dianhua_16000_2.pcm

./ffmpeg -i ../../dalei.mp3  -f s16le -ar 16000 -acodec pcm_s16le -ac 1   ../../dalei_16000_2.pcm
./ffmpeg -i ../../xiayu.mp3   -f s16le -ar 16000 -acodec pcm_s16le -ac 1  ../../xiayu_16000_2.pcm

./ffmpeg -i ../../dalei.mp3  -f s16le -ar 16000 -acodec pcm_s16le -ac 2   ../../dalei_16000_2_2.pcm
./ffmpeg -i ../../xiayu.mp3   -f s16le -ar 16000 -acodec pcm_s16le -ac 2  ../../xiayu_16000_2_2.pcm

./ffmpeg -i ../../dianhua.mp3  -f s16le -ar 16000 -acodec pcm_s16le -ac 2  ../../dianhua_16000_2.wav
./ffmpeg -f s16le -acodec pcm_s16le -ar 16000   -ac 2   -i ../../dalei_16000_2_2.pcm  -ac 2 -ar 16000  -y  ../../dalei_16000_2.wav
./ffmpeg -f s16le -acodec pcm_s16le -ar 16000    -ac 2 -i ../../xiayu_16000_2_2.pcm  -ac 2 -ar 16000  -y  ../../xiayu_16000_2.wav
降低音量
./ffmpeg -i ../../dianhua.mp3  -f s16le -ar 16000 -acodec pcm_s16le -ac 2   -filter:a "volume=0.2"  ../../dianhua_16000_2_05.wav

转 wav
./ffmpeg -f s16be -acodec pcm_s16be -ar 16000   -ac 2   -i ../../dalei_16000_2.pcm  -ac 2 -ar 16000  -y  ../../dalei_16000_2.wav
./ffmpeg -f s16be -acodec pcm_s16be -ar 16000    -ac 2 -i ../../xiayu_16000_2.pcm  -ac 2 -ar 16000  -y  ../../xiayu_16000_2.wav
合成pcm
./ffmpeg -f  s16be -acodec pcm_s16be  -ac 2 -ar 16000 -i ../../dalei_16000_2.pcm  -f  s16be -acodec pcm_s16be  -ar 16000  -ac 2  -i ../../xiayu_16000_2.pcm   -filter_complex amix=inputs=2:duration=first:dropout_transition=2  -f s16be  -ar 16000 -acodec pcm_s16be  -ac 2  ../../ff_daleixiayuffmix.pcm

播放pcm
./ffplay -ar 48000 -channels 2 -f f32le ../../daleixiayumix.pcm
./ffplay -ar 48000 -channels 2 -f f32le   ../../dalei_16000_2.pcm
./ffplay -ar 16000 -channels 2 -f f32le   ../../xiayu_16000_2.pcm
./ffplay -ar 16000 -channels 2 -f s16be   ../../ff_daleixiayuffmix.pcm

./ffplay -ar 16000 -channels 2 -f s16be ../../daleixiayumix.pcm