Am 29.07.2019 um 06:57 schrieb Gyan:
On 28-07-2019 11:04 PM, Michael Koch wrote:
Hi all,
I just tried this command line and it crashes FFmpeg:
ffmpeg -i meteor308.mp4 -vf fade=in:0:0.5 -q:v 1 -y 308.mp4
I already know what's wrong. I thought the fade duration is expressed
in seconds. But (with this syntax) it must be expressed in frames and
must be an integer. It would be nice to get an error message instead
of a crash.
Even if an option expects an integer, the parser will accept a
fractional number and cast it to an integer by truncating it. In this
case, for nb_frames, 0.5 gets cast to 0, and the first step of filter
initialization is division by nb_frames. Will add a check.
thank you!
By the way, is it possible to make a fade-out at the end of a video
without knowing the video length?
I mean that the start time of the fade-out is automatically set to
(video_length - fade_duration).
Michael
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