[FFmpeg-user] What is the correct way to cut the video with ffmpeg?

[Carl Eugen Hoyos]

桃源老師 <xanadu6291 <at> dream.jp> writes:

> The resulting video playbacks fine with ffplay and VLC 

So there is no problem for which you are searching for a solution?

> except QuickTime Player have approx. 2 seconds black screen on start.

The reason could be different start times for audio and video, 
it does not sound related to key frames.

It is generally correct that with "-codec copy" video can only be 
cut on key frames. For h264, it may no be so easy to define a 
"key frame", valid h264 streams without key frames exist, it should 
still be possible to cut them.

Carl Eugen