FFFMPEG：无法为“aac”aac 找到合适的 output 格式：参数无效

Question

嗨，使用以下命令将两个视频合并到一个文件中。

String[] complexCommand = {"-i", yourRealPath, "-i", compare_moviePath, "-filter_complex", "[0:v]setpts=PTS-STARTPTS, " +
                    "scale=480x360[top];[1:v]setpts=PTS-STARTPTS, scale=480x360,format=yuva420p,colorchannelmixer=aa=0.5[bottom];" +
                    "[top][bottom]overlay=shortest=1", "-acodec", "-c:a", "aac", "-vcodec", "libx264", filePath};

当我在 cmd 中输入它时，我得到以下行：

    ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.9.x (GCC) 20150123 (prerelease)
  configuration: --prefix=/home/yash/ffmpeg-binary-android-master/build_scripts/build_dir --target-os=linux --arch=arm64 --cross-prefix=/home/yash/android-ndk-r15c/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android- --enable-cross-compile --sysroot=/home/yash/android-ndk-r15c/platforms/android-21/arch-arm64/ --pkg-config=/usr/bin/pkg-config --pkg-config-flags=--static --enable-pic --enable-small --enable-gpl --enable-nonfree --disable-shared --enable-static --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --enable-libmp3lame --enable-libx264 --enable-bsf=aac_adtstoasc --enable-openssl --enable-libfreetype --enable-libfontconfig --enable-pthreads --enable-zlib --disable-doc
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  libpostproc    54.  5.100 / 54.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/v1golf/Android/data/com.v1.v1golf2/files/VID_20191004_163521.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.71.100
  Duration: 00:00:05.76, start: 0.000000, bitrate: 4915 kb/s
    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 768x1024 [SAR 1:1 DAR 3:4], 4963 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 25 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/v1golf/Android/data/com.v1.v1golf2/files/1908151648466PEV-260690.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.40.101
  Duration: 00:00:07.23, start: 0.000000, bitrate: 21924 kb/s
    Stream #1:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 1280x720, 21923 kb/s, 59.86 fps, 60 tbr, 15360 tbn, 120 tbc (default)
    Metadata:
      handler_name    : VideoHandler
[NULL @ 0x76fde80e00] Unable to find a suitable output format for 'aac'
aac: Invalid argument

我不明白怎么了。 有人可以帮我解决吗？

删除日志下面-acodec后：-

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/v1golf/Android/data/com.v1.v1golf2/files/VID_20191004_163521.mp4':
  Duration: 00:00:05.76, start: 0.000000, bitrate: 4915 kb/s
      Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 768x1024 [SAR 1:1 DAR 3:4], 4963 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
            handler_name    : VideoHandler
                Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 25 kb/s (default)
                Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/v1golf/Android/data/com.v1.v1golf2/files/1908151648466PEV-260690.mp4':
                    compatible_brands: isomiso2avc1mp41
                      Duration: 00:00:07.23, start: 0.000000, bitrate: 21924 kb/s
                          Stream #1:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 1280x720, 21923 kb/s, 59.86 fps, 60 tbr, 15360 tbn, 120 tbc (default)
                           handler_name    : VideoHandler

Answer 1

String[] complexCommand = {"-i", yourRealPath, "-i", compare_moviePath, "-filter_complex", "[0:v]setpts=PTS-STARTPTS, " +
                    "scale=480x360[top];[1:v]setpts=PTS-STARTPTS, scale=480x360,format=yuva420p,colorchannelmixer=aa=0.5[bottom];" +
                    "[top][bottom]overlay=shortest=1", "-acodec","copy", "-vcodec", "libx264", filePath};

试试上面的代码