[Cin] Cutting mkv causes video to stop at cut points

[Phyllis Smith]

Andrea,
  Do you think we should try to add some of Igor's information to the
manual? MKV seems to have a lot of differences that cause issues because it
is an Open Standard and can be used anyway (as opposed to MP4 which is not
for free commerical use).

On Fri, Nov 25, 2022 at 6:01 AM Igor BEGHETTO via Cin <
cin at lists.cinelerra-gg.org> wrote:

> Thanks Stefan for your test file.
> In Cinelerra-GG, for what I are seeing, the problem is not cutting the
> video in the Timeline; the video also freezes without cutting anything
> and playing frome some points.
>
> Your video use long GOP (max 250): there are I-frame, B-frame, P-frame.
> The I-frames are at: I-0001, I-0220, I-0447, I-0697, I-0913, I-1163 and
> I-1342.
>
> Like me, you can do an easy test in Cinelerra-GG.
> 1. On the Timebar, in the Main Window, change the display from "Frames"
> to "Hours:minutes:seconds: frames" (use Right Mouse Button on it, see
> https://cinelerra-gg.org/download/CinelerraGG_Manual/Insertion_Point.html).
>
> So you can see "Frames" instead of "Hours:minutes:seconds: frames".
> 2. Add two labels at 913 and 1163 (you can use "Go to" tool)
> 3. Move the Insertion Point at 930, for example, and press Play
> (Numpad-3): it should work fine.
> 4. Move the Insertion Point at 850, for example, and press Play
> (Numpad-3): video freezes until it reaches the I-frame (at 913).
>
> The same happens for the other I-frames. It seems a problem around some
> B-frame and P-frame. As Andrea_paz said, the MKV codec format can be
> problematic if the encoding is not done well by the program (OBS?). I
> don't use OBS Studio, so I can't try it using other output format codec.
>
> Possible solutions:
> a) As told by Andrea and Phyllis, using Transcode's Cinelerra-GG or an
> other Convert tool.
> b) In OBS Studio change the output codec, for example TS (Transport
> Stream), MOV, MPEG2, or ???.
>
> Because your video is yuvj444p h264 High 4:4:4 Predictive, in OBS can
> you change any parameters of that? For example to yuvj420p and try?
>
>
> IgorBeg
>
> PS:
> other Users have many problems with MKV files from OBS Studio using
> Commercial NLE (LightWorks is one of them)
> --
> Cin mailing list
> Cin at lists.cinelerra-gg.org
> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>
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