[FFmpeg-user] mp4 concatenation (muxer) problems -- invalid output?

Carl Eugen Hoyos ceffmpeg at gmail.com
Tue Feb 21 02:31:50 EET 2017

2017-02-20 2:33 GMT+01:00 John A Hawkinson <jhawk at mit.edu>:

> pb3:test jhawk$ ffmpeg -loop 1 -i f1.png -t 3.933 -pix_fmt yuv420p -r 29.97   h5.mp4

If you want ntsc framerate, you have to specify -r 30000/1001

> So, now I want to concatenate the held frame (3.9 seconds) with the
> video (1.1 seconds). Their formats are not EXACTLY the same, as reported
> by ffprobe, but they are close:

The "video" was encoded by a hardware encoder, the "held frame" by
x264, you cannot concatenate them.
(ffprobe output is completely irrelevant here, it does not show
technical details.)

Carl Eugen

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