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私はこのコードを使ってLinuxサーバにウォーターマークを適用しています。FFMPEGで変換中にエラーが発生しましたか？それはどういう意味ですか、どのように修正すべきですか？
-i input.mp4 logo.png -filter_complex 'overlay=main_w-overlay_w-10:main_h-overlay_h-10' output.mp4
このエラーで終了しました。
Please use -b:a or -b:v, -b is ambiguous
Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_overlay_0
完全なエラーです。
ffmpeg version N-71954-gbc6f84f Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16)
configuration: --prefix=/usr --enable-version3 --enable-gpl --enable-shared --
enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libvpx --
enable-libx264 --enable-libxvid --enable-libopencore-amrwb --enable-libopencore-
amrnb --enable-postproc --enable-nonfree --enable-pthreads --enable-x11grab --
enable-libfaac --enable-libopenjpeg --enable-zlib --disable-doc
libavutil 54. 23.101/54. 23.101
libavcodec 56. 37.101/56. 37.101
libavformat 56. 31.102/56. 31.102
libavdevice 56. 4.100/56. 4.100
libavfilter 5. 16.101/5. 16.101
libswscale 3. 1.101/3. 1.101
libswresample 1. 1.100/1. 1.100
libpostproc 53. 3.100/53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'uploaded/1502539665_21.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.31.102
enter code here
Duration: 00:02:27.32, start: 0.023220, bitrate: 635 kb/s
Stream #0:0(und): Video: h264 (High) (avc1/0x31637661), yuv420p, 480x320
[SAR 1:1 DAR 3:2], 476 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
enter code here
Stream #0:1(und): Audio: aac (LC) (mp4a/0x6134706D), 44100 Hz, stereo, fltp, 151 kb/s (default)
Metadata:
handler_name : SoundHandler
enter code here
Please use -b:a or -b:v, -b is ambiguous
Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_overlay_0