FFmpeg在启动时卡住了几秒钟 [英] FFmpeg stucks for few seconds on start

问题描述

我正在尝试在Android上剪切视频并调整大小(但在MacOS上却类似)，但是当我运行ffmpeg命令时，它会返回我

I'm trying to cut and resize video on Android(but it is similar on MacOS) , but when I run the ffmpeg command it returns me

frame = 0 fps = 0.0 q = 0.0 size = 0kB时间= 00:00:00.00比特率= N/A速度=

frame= 0 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed=

它重复大约20秒(我有3K持续时间的4K视频).

It repeats for about 20 sec (I have 4K video with 3 sec duration).

有什么方法可以提高处理速度吗?这是我的ffmpeg命令的示例

Is there any way to improve process speed? Here is example of my ffmpeg command

ffmpeg -y -i input.mp4 -ss 00:01.82 -to 00:02.94 -vf scale = 500:1024 -c:v libx264 -c:a aac -b:v 500k -b:a 96k输出. mp4

ffmpeg -y -i input.mp4 -ss 00:01.82 -to 00:02.94 -vf scale=500:1024 -c:v libx264 -c:a aac -b:v 500k -b:a 96k output.mp4

推荐答案

在输入执行解码的帧查找之后使用-ss，这比较慢.切换到解复用器搜索

Use of -ss after the input performs a decoded frame seek, which is slower. Switch to demuxer seek

ffmpeg -y -ss 00:01.82 -to 00:02.94 -i input.mp4 -vf scale=500:1024 -c:v libx264 -c:a aac -b:v 500k -b:a 96k output.mp4

用于Demuxer的

-to是最近才添加的，因此获取当前的git版本.否则，在计算出的持续时间中使用-t.

-to for demuxer was only recently added, so get a current git version. Else, use -t with the calculated duration.

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