我在使用ffmpeg时遇到了问题,我尝试向视频中添加一个png文件。我找到了如何添加它,但我希望这个png文件有一定的透明度。 我尝试了以下命令:
ffmpeg -n -i video.mp4 -i logo.png -filter_complex "setsar=sar=1;blend=all_mode='overlay':all_opacity=0.7" -movflags +faststart tmb/video.mp4
使用此命令,ffmpeg会返回以下错误
Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_blend_1
并且那里有完整的日志记录
ffmpeg version 2.7.5-0ubuntu0.15.10.1 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 5.2.1 (Ubuntu 5.2.1-22ubuntu2) 20151010
configuration: --prefix=/usr --extra-version=0ubuntu0.15.10.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-frei0r --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-openal --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libxvid --enable-libzvbi --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-libssh --enable-libsoxr --enable-libx264 --enable-libopencv --enable-libx265
libavutil 54. 27.100 / 54. 27.100
libavcodec 56. 41.100 / 56. 41.100
libavformat 56. 36.100 / 56. 36.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 16.101 / 5. 16.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.100 / 1. 2.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf54.59.106
Duration: 00:06:17.68, start: 0.023220, bitrate: 1660 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x720 [SAR 8:9 DAR 4:3], 1527 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #1, png_pipe, from 'logo.png':
Duration: N/A, bitrate: N/A
Stream #1:0: Video: png, rgba(pc), 1080x720 [SAR 3780:3780 DAR 3:2], 25 tbr, 25 tbn, 25 tbc
Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_blend_1
我对ffmpeg不太了解,试图通过谷歌寻找解决方案但未能成功。
如果不使用setsar=sar=1,会出现关于两个不同sar的错误。
[Parsed_blend_0 @ 0x14bb0e0] First input link top parameters (size 1080x720, SAR 8:9) do not match the corresponding second input link bottom parameters (1080x720, SAR 1:1)
[Parsed_blend_0 @ 0x14bb0e0] Failed to configure output pad on Parsed_blend_0
感谢您的帮助