[FFmpeg-user] Dropping frames on simple split and recombine.

[Scott Chamberlain]

On Mon, Sep 14, 2015 at 4:45 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
>
>
> Then please use the fifo filter.
>
> Carl Eugen
>

I guess I do not understand how to use the filter correctly.

If I try

split[original],select='1+gt(t,5)+gt(t,10)':n=3[v1][v2][v3];[v1]setpts=PTS-STARTPTS[v1o];[v2]setpts=PTS-STARTPTS[v2o];[v3]setpts=PTS-STARTPTS[v3o];[v1o][v2o][v3o]concat=n=3,fifo[modified];[original][modified]vstack

it gives me the warning

[Parsed_vstack_7 @ 0000000002414c60] [framesync @ 0000000002338b28] Buffer
queue overflow, dropping.

And my output video freezes the top timer at 7:03 like before and the
bottom timer now freezes at 4:29. (See Out1.mp4)


If I try

split[original],select='1+gt(t,5)+gt(t,10)':n=3[v1][v2][v3];[v1]setpts=PTS-STARTPTS[v1o];[v2]setpts=PTS-STARTPTS[v2o];[v3]setpts=PTS-STARTPTS[v3o];[v1o][v2o][v3o]concat=n=3[modified];[original]fifo,[modified]vstack

it gives me the warning

[Parsed_vstack_7 @ 00000000025145c0] [framesync @ 0000000002438928] Buffer
queue overflow, dropping.

And my output video freezes the top timer at 7:03 and the bottom timer
counts all the way to the end, the same behavior as Out.mp4 from my
original email.


If I try

split[original],select='1+gt(t,5)+gt(t,10)':n=3[v1][v2][v3];[v1]setpts=PTS-STARTPTS[v1o];[v2]setpts=PTS-STARTPTS[v2o];[v3]setpts=PTS-STARTPTS[v3o];[v1o][v2o][v3o]concat=n=3,fifo[modified];[original]fifo,[modified]vstack

It gives me no warnings but in the output video the top timer freezes at
4:09 and the bottom timer counts all the way to the end (see Out3.mp4).


What is the proper way to use fifo to fix my issue?

On Mon, Sep 14, 2015 at 4:45 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> Scott Chamberlain <leftler <at> gmail.com> writes:
>
> > I during the processing I get the warnings:
> >
> > [Parsed_vstack_6  <at>  0000000000d5ee60]
> > [framesync  <at>  0000000000c77cc8] Buffer
> > queue overflow, dropping.
>
> Then please use the fifo filter.
>
> Carl Eugen
>
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