目前正在尝试将两个音频流混合在一起以执行叠加。 （人声乐器）。我有两个M4A文件，我想将它们组合在一起。如果声道是30秒，将它们混合在一起大约需要32秒，但是希望能够显着加快处理速度。
以下是我使用
的代码-ss 0.300 -i /data/user/0/me.rapchat.rapchat/cache/recording.m4a -i /data/user/0/me.rapchat.rapchat/cache/beats/cc3613da-849b-47a5-97b1-b9bf3f1136db.m4a -filter_complex [0:a][1:a]amerge=inputs=2,pan=stereo|c0<c0+c2|c1<c1+c3[aout] -map [aout] /data/user/0/me.rapchat.rapchat/cache/rap.m4a
我已经阅读了有关使用预设超快但不确定它如何适应的内容，因为我已尝试添加它并在命令中出现错误。我还读到了关于复制流的问题＆＃34;按原样＃34;并且不担心编码/解码，如果这会加快整个过程，我很好奇。
这是我成功混合的日志
09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process: ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process: built with gcc 4.8 (GCC)
09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process: configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --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/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process: libavutil 55. 17.103 / 55. 17.103
09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process: libavcodec 57. 24.102 / 57. 24.102
09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process: libavformat 57. 25.100 / 57. 25.100
09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process: libavdevice 57. 0.101 / 57. 0.101
09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process: libavfilter 6. 31.100 / 6. 31.100
09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process: libswscale 4. 0.100 / 4. 0.100
09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process: libswresample 2. 0.101 / 2. 0.101
09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process: libpostproc 54. 0.100 / 54. 0.100
09-23 15:08:08.442 13909-13909/me.rapchat.rapchat E/Studio Process: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/me.rapchat.rapchat/cache/recording.m4a':
09-23 15:08:08.442 13909-13909/me.rapchat.rapchat E/Studio Process: Metadata:
09-23 15:08:08.442 13909-13909/me.rapchat.rapchat E/Studio Process: major_brand : mp42
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: minor_version : 0
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: compatible_brands: isommp42
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: creation_time : 2016-09-23 20:08:08
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: com.android.version: 6.0.1
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: Duration: 00:00:34.74, start: 0.000000, bitrate: 64 kb/s
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: Stream #0:0(eng): Audio: aac (HE-AAC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 64 kb/s (default)
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: Metadata:
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: creation_time : 2016-09-23 20:08:08
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: handler_name : SoundHandle
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/me.rapchat.rapchat/cache/beats/cc3613da-849b-47a5-97b1-b9bf3f1136db.m4a':
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: Metadata:
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: major_brand : M4A
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: minor_version : 0
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: compatible_brands: M4A mp42isom
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: creation_time : 2016-06-21 20:00:19
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: artist :
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: album : Rapchat
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: date : 2016
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: composer :
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: title : wrist - beat
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: encoder : 10.2.0
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: iTunSMPB : 00000000 00000840 000003BF 00000000004A0001 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: Duration: 00:01:50.04, start: 0.000000, bitrate: 110 kb/s
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: Stream #1:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 259 kb/s (default)
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: Metadata:
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: creation_time : 2016-06-21 20:00:19
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: [Parsed_amerge_0 @ 0xf6f57140] No channel layout for input 1
09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: [Parsed_amerge_0 @ 0xf6f57140] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
09-23 15:08:08.472 13909-13909/me.rapchat.rapchat E/Studio Process: Output #0, ipod, to '/data/user/0/me.rapchat.rapchat/cache/rap.m4a':
09-23 15:08:08.472 13909-13909/me.rapchat.rapchat E/Studio Process: Metadata:
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: major_brand : mp42
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: minor_version : 0
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: compatible_brands: isommp42
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: com.android.version: 6.0.1
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: encoder : Lavf57.25.100
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: Metadata:
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: encoder : Lavc57.24.102 aac
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: Stream mapping:
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: Stream #0:0 (aac) -> amerge:in0
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: Stream #1:0 (aac) -> amerge:in1
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: pan -> Stream #0:0 (aac)
09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process: Press [q] to stop, [?] for help
09-23 15:08:09.022 13909-13909/me.rapchat.rapchat E/Studio Process: size= 9kB time=00:00:00.62 bitrate= 115.8kbits/s speed=1.22x
09-23 15:08:09.532 13909-13909/me.rapchat.rapchat E/Studio Process: size= 21kB time=00:00:01.41 bitrate= 122.7kbits/s speed=1.39x
09-23 15:08:10.032 13909-13909/me.rapchat.rapchat E/Studio Process: size= 34kB time=00:00:02.20 bitrate= 124.6kbits/s speed=1.45x
09-23 15:08:10.532 13909-13909/me.rapchat.rapchat E/Studio Process: size= 47kB time=00:00:03.04 bitrate= 125.6kbits/s speed= 1.5x
09-23 15:08:11.052 13909-13909/me.rapchat.rapchat E/Studio Process: size= 59kB time=00:00:03.83 bitrate= 126.1kbits/s speed=1.51x
09-23 15:08:11.552 13909-13909/me.rapchat.rapchat E/Studio Process: size= 71kB time=00:00:04.62 bitrate= 126.4kbits/s speed=1.51x
09-23 15:08:12.062 13909-13909/me.rapchat.rapchat E/Studio Process: size= 84kB time=00:00:05.41 bitrate= 126.6kbits/s speed=1.52x
09-23 15:08:12.582 13909-13909/me.rapchat.rapchat E/Studio Process: size= 97kB time=00:00:06.24 bitrate= 126.8kbits/s speed=1.53x
09-23 15:08:13.072 13909-13909/me.rapchat.rapchat E/Studio Process: size= 109kB time=00:00:07.03 bitrate= 126.9kbits/s speed=1.54x
09-23 15:08:13.572 13909-13909/me.rapchat.rapchat E/Studio Process: size= 121kB time=00:00:07.82 bitrate= 127.1kbits/s speed=1.54x
09-23 15:08:14.092 13909-13909/me.rapchat.rapchat E/Studio Process: size= 134kB time=00:00:08.61 bitrate= 127.1kbits/s speed=1.54x
09-23 15:08:14.602 13909-13909/me.rapchat.rapchat E/Studio Process: size= 146kB time=00:00:09.40 bitrate= 127.2kbits/s speed=1.54x
09-23 15:08:15.122 13909-13909/me.rapchat.rapchat E/Studio Process: size= 159kB time=00:00:10.24 bitrate= 127.3kbits/s speed=1.55x
09-23 15:08:15.592 13909-13909/me.rapchat.rapchat E/Studio Process: size= 171kB time=00:00:10.98 bitrate= 127.3kbits/s speed=1.55x
09-23 15:08:16.112 13909-13909/me.rapchat.rapchat E/Studio Process: size= 183kB time=00:00:11.77 bitrate= 127.4kbits/s speed=1.55x
09-23 15:08:16.612 13909-13909/me.rapchat.rapchat E/Studio Process: size= 195kB time=00:00:12.56 bitrate= 127.4kbits/s speed=1.55x
09-23 15:08:17.122 13909-13909/me.rapchat.rapchat E/Studio Process: size= 208kB time=00:00:13.39 bitrate= 127.4kbits/s speed=1.55x
09-23 15:08:17.692 13909-13909/me.rapchat.rapchat E/Studio Process: size= 217kB time=00:00:13.90 bitrate= 127.9kbits/s speed=1.52x
09-23 15:08:18.162 13909-13909/me.rapchat.rapchat E/Studio Process: size= 223kB time=00:00:14.28 bitrate= 127.8kbits/s speed=1.48x
09-23 15:08:18.662 13909-13909/me.rapchat.rapchat E/Studio Process: size= 229kB time=00:00:14.65 bitrate= 127.8kbits/s speed=1.44x
09-23 15:08:19.202 13909-13909/me.rapchat.rapchat E/Studio Process: size= 235kB time=00:00:15.06 bitrate= 127.7kbits/s speed=1.41x
09-23 15:08:19.792 13909-13909/me.rapchat.rapchat E/Studio Process: size= 240kB time=00:00:15.39 bitrate= 127.8kbits/s speed=1.38x
09-23 15:08:20.192 13909-13909/me.rapchat.rapchat E/Studio Process: size= 244kB time=00:00:15.67 bitrate= 127.8kbits/s speed=1.34x
09-23 15:08:20.712 13909-13909/me.rapchat.rapchat E/Studio Process: size= 252kB time=00:00:16.13 bitrate= 127.7kbits/s speed=1.32x
09-23 15:08:21.242 13909-13909/me.rapchat.rapchat E/Studio Process: size= 257kB time=00:00:16.46 bitrate= 127.8kbits/s speed=1.29x
09-23 15:08:21.752 13909-13909/me.rapchat.rapchat E/Studio Process: size= 260kB time=00:00:16.64 bitrate= 127.8kbits/s speed=1.25x
09-23 15:08:22.272 13909-13909/me.rapchat.rapchat E/Studio Process: size= 264kB time=00:00:16.92 bitrate= 127.7kbits/s speed=1.23x
09-23 15:08:22.882 13909-13909/me.rapchat.rapchat E/Studio Process: size= 269kB time=00:00:17.29 bitrate= 127.6kbits/s speed=1.21x
09-23 15:08:23.352 13909-13909/me.rapchat.rapchat E/Studio Process: size= 274kB time=00:00:17.62 bitrate= 127.5kbits/s speed=1.19x
09-23 15:08:23.952 13909-13909/me.rapchat.rapchat E/Studio Process: size= 282kB time=00:00:18.13 bitrate= 127.6kbits/s speed=1.18x
09-23 15:08:24.372 13909-13909/me.rapchat.rapchat E/Studio Process: size= 285kB time=00:00:18.32 bitrate= 127.6kbits/s speed=1.15x
09-23 15:08:24.892 13909-13909/me.rapchat.rapchat E/Studio Process: size= 290kB time=00:00:18.59 bitrate= 127.6kbits/s speed=1.13x
09-23 15:08:25.402 13909-13909/me.rapchat.rapchat E/Studio Process: size= 293kB time=00:00:18.85 bitrate= 127.5kbits/s speed=1.12x
09-23 15:08:26.032 13909-13909/me.rapchat.rapchat E/Studio Process: size= 300kB time=00:00:19.24 bitrate= 127.5kbits/s speed= 1.1x
09-23 15:08:26.462 13909-13909/me.rapchat.rapchat E/Studio Process: size= 304kB time=00:00:19.57 bitrate= 127.4kbits/s speed=1.09x
09-23 15:08:27.042 13909-13909/me.rapchat.rapchat E/Studio Process: size= 309kB time=00:00:19.89 bitrate= 127.4kbits/s speed=1.07x
09-23 15:08:27.622 13909-13909/me.rapchat.rapchat E/Studio Process: size= 312kB time=00:00:20.08 bitrate= 127.4kbits/s speed=1.05x
09-23 15:08:28.182 13909-13909/me.rapchat.rapchat E/Studio Process: size= 317kB time=00:00:20.36 bitrate= 127.4kbits/s speed=1.03x
09-23 15:08:28.702 13909-13909/me.rapchat.rapchat E/Studio Process: size= 322kB time=00:00:20.68 bitrate= 127.3kbits/s speed=1.02x
09-23 15:08:29.262 13909-13909/me.rapchat.rapchat E/Studio Process: size= 326kB time=00:00:20.96 bitrate= 127.3kbits/s speed=1.01x
09-23 15:08:29.762 13909-13909/me.rapchat.rapchat E/Studio Process: size= 332kB time=00:00:21.38 bitrate= 127.3kbits/s speed=1.01x
09-23 15:08:30.282 13909-13909/me.rapchat.rapchat E/Studio Process: size= 339kB time=00:00:21.80 bitrate= 127.3kbits/s speed= 1x
09-23 15:08:30.892 13909-13909/me.rapchat.rapchat E/Studio Process: size= 345kB time=00:00:22.22 bitrate= 127.3kbits/s speed=0.995x
09-23 15:08:31.392 13909-13909/me.rapchat.rapchat E/Studio Process: size= 352kB time=00:00:22.63 bitrate= 127.3kbits/s speed=0.989x
09-23 15:08:31.942 13909-13909/me.rapchat.rapchat E/Studio Process: size= 359kB time=00:00:23.10 bitrate= 127.3kbits/s speed=0.986x
09-23 15:08:32.452 13909-13909/me.rapchat.rapchat E/Studio Process: size= 363kB time=00:00:23.38 bitrate= 127.3kbits/s speed=0.977x
09-23 15:08:32.932 13909-13909/me.rapchat.rapchat E/Studio Process: size= 367kB time=00:00:23.61 bitrate= 127.4kbits/s speed=0.966x
09-23 15:08:33.542 13909-13909/me.rapchat.rapchat E/Studio Process: size= 372kB time=00:00:23.93 bitrate= 127.3kbits/s speed=0.96x
09-23 15:08:33.942 13909-13909/me.rapchat.rapchat E/Studio Process: size= 378kB time=00:00:24.31 bitrate= 127.3kbits/s speed=0.955x
09-23 15:08:34.462 13909-13909/me.rapchat.rapchat E/Studio Process: size= 384kB time=00:00:24.68 bitrate= 127.3kbits/s speed=0.951x
09-23 15:08:35.022 13909-13909/me.rapchat.rapchat E/Studio Process: size= 389kB time=00:00:25.05 bitrate= 127.3kbits/s speed=0.945x
09-23 15:08:35.542 13909-13909/me.rapchat.rapchat E/Studio Process: size= 392kB time=00:00:25.24 bitrate= 127.3kbits/s speed=0.933x
09-23 15:08:36.082 13909-13909/me.rapchat.rapchat E/Studio Process: size= 399kB time=00:00:25.65 bitrate= 127.3kbits/s speed=0.931x
09-23 15:08:36.572 13909-13909/me.rapchat.rapchat E/Studio Process: size= 405kB time=00:00:26.07 bitrate= 127.3kbits/s speed=0.929x
09-23 15:08:37.082 13909-13909/me.rapchat.rapchat E/Studio Process: size= 410kB time=00:00:26.40 bitrate= 127.3kbits/s speed=0.924x
09-23 15:08:37.632 13909-13909/me.rapchat.rapchat E/Studio Process: size= 417kB time=00:00:26.81 bitrate= 127.3kbits/s speed=0.921x
09-23 15:08:37.862 13909-16848/me.rapchat.rapchat I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
09-23 15:08:37.862 13909-16848/me.rapchat.rapchat I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
09-23 15:08:38.172 13909-13909/me.rapchat.rapchat E/Studio Process: size= 422kB time=00:00:27.14 bitrate= 127.3kbits/s speed=0.915x
09-23 15:08:38.672 13909-13909/me.rapchat.rapchat E/Studio Process: size= 427kB time=00:00:27.51 bitrate= 127.3kbits/s speed=0.912x
09-23 15:08:39.182 13909-13909/me.rapchat.rapchat E/Studio Process: size= 432kB time=00:00:27.79 bitrate= 127.4kbits/s speed=0.906x
09-23 15:08:39.692 13909-13909/me.rapchat.rapchat E/Studio Process: size= 440kB time=00:00:28.25 bitrate= 127.5kbits/s speed=0.906x
09-23 15:08:40.202 13909-13909/me.rapchat.rapchat E/Studio Process: size= 449kB time=00:00:28.81 bitrate= 127.6kbits/s speed=0.909x
09-23 15:08:40.702 13909-13909/me.rapchat.rapchat E/Studio Process: size= 456kB time=00:00:29.28 bitrate= 127.7kbits/s speed=0.909x
09-23 15:08:41.222 13909-13909/me.rapchat.rapchat E/Studio Process: size= 463kB time=00:00:29.69 bitrate= 127.8kbits/s speed=0.908x
09-23 15:08:41.782 13909-13909/me.rapchat.rapchat E/Studio Process: size= 471kB time=00:00:30.16 bitrate= 127.9kbits/s speed=0.907x
09-23 15:08:42.282 13909-13909/me.rapchat.rapchat E/Studio Process: size= 477kB time=00:00:30.53 bitrate= 128.0kbits/s speed=0.905x
09-23 15:08:42.782 13909-13909/me.rapchat.rapchat E/Studio Process: size= 485kB time=00:00:31.04 bitrate= 128.1kbits/s speed=0.906x
09-23 15:08:43.292 13909-13909/me.rapchat.rapchat E/Studio Process: size= 494kB time=00:00:31.55 bitrate= 128.2kbits/s speed=0.907x
09-23 15:08:43.872 13909-13909/me.rapchat.rapchat E/Studio Process: size= 501kB time=00:00:31.97 bitrate= 128.4kbits/s speed=0.905x
09-23 15:08:44.472 13909-13909/me.rapchat.rapchat E/Studio Process: size= 510kB time=00:00:32.48 bitrate= 128.5kbits/s speed=0.906x
09-23 15:08:44.872 13909-13909/me.rapchat.rapchat E/Studio Process: size= 516kB time=00:00:32.85 bitrate= 128.6kbits/s speed=0.904x
09-23 15:08:45.442 13909-13909/me.rapchat.rapchat E/Studio Process: size= 524kB time=00:00:33.36 bitrate= 128.7kbits/s speed=0.903x
09-23 15:08:46.012 13909-13909/me.rapchat.rapchat E/Studio Process: size= 529kB time=00:00:33.69 bitrate= 128.7kbits/s speed=0.898x
09-23 15:08:46.512 13909-13909/me.rapchat.rapchat E/Studio Process: size= 532kB time=00:00:33.87 bitrate= 128.7kbits/s speed=0.891x
09-23 15:08:47.072 13909-13909/me.rapchat.rapchat E/Studio Process: size= 536kB time=00:00:34.11 bitrate= 128.7kbits/s speed=0.885x
09-23 15:08:47.572 13909-13909/me.rapchat.rapchat E/Studio Process: size= 540kB time=00:00:34.38 bitrate= 128.7kbits/s speed=0.88x
09-23 15:08:47.722 13909-13909/me.rapchat.rapchat E/Studio Process: size= 547kB time=00:00:34.45 bitrate= 130.2kbits/s speed=0.878x
09-23 15:08:47.722 13909-13909/me.rapchat.rapchat E/Studio Process: video:0kB audio:541kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.207577%
09-23 15:08:47.722 13909-13909/me.rapchat.rapchat E/Studio Process: [aac @ 0xf6f43400] Qavg: 12320.994
问题是这有一些时间延迟，我不知道如何优化它。我对FFMPEG很陌生，在投入预设和编解码器时，语法具有相当的学习曲线。预设的超快速是我想要的，我该如何将它添加到这个？
提前谢谢！