FFMPEG - 具有相同质量和文件大小的水印视频 [英] FFMPEG - Watermark video with same quality and filesize
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问题描述
我有一些视频,我想用透明的PNG水印他们。这是我试过的:
I have some videos, and I'd like to watermark them with a transparent PNG. Here's what I've tried:
ffmpeg -i 9.flv -vf "movie=logo.png [watermark];[in][watermark] overlay=10:10 [out]" 9_w.flv
但是,质量不保留。最好我想ffmpeg重新编码与原始文件(相同的编解码器,比特率)设置完全相同的文件。如果这不容易,我想使用特定的编解码器进行编码,但是保留质量,但是这是测量的。
However, bitrate or quality is not preserved. Preferably I'd like ffmpeg to re-encode the file with exactly the same settings as the original file (same codecs, bitrate). If thats not easily possible, I'd like to encode with a specific codec, but preserving 'quality', however that is measured.
推荐答案
尝试
ffmpeg -i 9.flv -vf "movie=logo.png [watermark];[in][watermark] overlay=10:10 [out]" -vcodec flv -sameq 9_w.flv
ffmpeg使用相同的视频编码质量。
this tells ffmpeg to use the same quality for video encoding.
您还可以添加
-acodec libmp3lame copy
之前输出要做同样的音频编码。
before the output to do the same with the audio encoding.
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