带水印的 ffmpeg 质量

发布于 2024-12-29 13:47:23 字数 795 浏览 4 评论 0原文

我想用 ffmpeg 给视频添加水印。此时，几乎所有事情都可以正常计算，只是新视频的质量大大低于原始视频的质量。

我还使用 ffmpeg-php 并尝试将 minrate 设置为原始比特率，但随后出现错误。目前代码看起来像这样。

$video     = new ffmpeg_movie('hot_wheels_for_adults.flv');
$watermark = 'path/to/watermark.png';
$width     = $video->getFrameWidth();
$height    = $video->getFrameHeight();
$exec = 'ffmpeg -i hot_wheels_for_adults.flv ' .
        '-y -vf "movie=' . $watermark . ' ' .
        '[watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]" ' .
        '-f flv -s ' . $width . 'x' . $height . ' ' .
        '-minrate ' . $video->getBitRate() . ' ' .
        'bla2.flv';

就是这样。如果没有“-minrate”行，质量就不好。原价 = 630615, 新视频的速率 = 328000。

使用“-sameq”标志，我获得了良好的质量，但它从 6,5MB 提高到近 30MB...

我现在能做什么？

原文

i want to add a watermark to a video with ffmpeg. At this time nearly all things are computing properly, except the quality of the new video is massively lower than in the one of the original video.

I also use ffmpeg-php and tried to set the minrate to the Bitrate of the original, but then i get an Error. Code seems like this at the moment.

$video     = new ffmpeg_movie('hot_wheels_for_adults.flv');
$watermark = 'path/to/watermark.png';
$width     = $video->getFrameWidth();
$height    = $video->getFrameHeight();
$exec = 'ffmpeg -i hot_wheels_for_adults.flv ' .
        '-y -vf "movie=' . $watermark . ' ' .
        '[watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]" ' .
        '-f flv -s ' . $width . 'x' . $height . ' ' .
        '-minrate ' . $video->getBitRate() . ' ' .
        'bla2.flv';

Thats it. Without the '-minrate' line the quality isnt good.
Originalrate = 630615,
Rate of new Video = 328000.

With the '-sameq' flag i got a good quality, but it is raised from 6,5MB to nearly 30MB...

What can i do now?

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