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

[Paul B Mahol]

On 9/15/15, Scott Chamberlain <leftler at gmail.com> wrote:
> 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).

And you expect what instead?

>
>
> 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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>