[FFmpeg-user] video slows down in the middle
confiscate at gmail.com
Thu Feb 8 03:16:49 EET 2018
Hey guys, sorry I am not a full member of the ffmpeg alias group yet. Do I
have to be a member to receive responses? Just curious because it looks
like there is some interest in this thread.Thanks!
On Tue, Feb 6, 2018 at 4:19 PM, Henry Lau <confiscate at gmail.com> wrote:
> I tried to convert a Webm file to MP4. The output MP4 file is fine, plays
> normally at the start.
> But for some reason, in the middle it goes into "slow-motion".
> It then speeds back up to normal speed at the end.
> The screenshot below is when I view the output MP4 in QuickTime. At the
> bottom, you can see a "frame bar" (not sure what it's officially called).
> The middle part is the part where it slows down.
> [image: Inline image 1]
> Command I used to convert:
> ./ffmpeg -i inputWebm out.mp4
> The input video is here
> The output is here
> Does anyone know why the output video slows down in the middle? Because
> when I view the input file, the "slow down in middle" issue does not happen.
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