Re: [Mlt-devel] melt stutter with canon dslr footage

[Dan D. <da...@de...>]

On Tue, Dec 4, 2012 at 1:29 AM, Adrian Ibanez <adr...@gm...> wrote:
> Hi
>
> First of all: thanks for creating MLT!
>
> I'm expiriencing some strange "stuttering" problem with some canon DSLR footage. It was filmed with a EOS 7D
> I'll have access to the camera again soon to get some more sample clips with other settings.
> To workaround the issue I have put a timeconsuming transcoding step in place … Being able to directly process such rawfootage would be a hughe improvement to my workflow.
>

I am not certain I am seeing the problem you are seeing. It seems they
play the same for me in Quicktime Player, ffplay, and melt built with
FFmpeg. I have not tested it with libav. If there is a problem, it
must be a very subtle like only occasionally a dropped frame. I assume
siince you wrote "strange" that the problem you see is more gross than
subtle.


> What could be causing these hickups? So far I only expirienced the behaviour with files from this particular camera. I also expirience the same stuttering behaviour when transcoding the h264 stream to prores.
>

Even the prores.mov looks mostly the same between all 3 said players.
Before I give this any more attention, you need to do a more
compelling job of convincing me there is a problem. For example, you
said the prores transcode exhibits the problem as well, but you have
not said how you transcoded it or what all media players you played it
in to narrow it down to a melt-specific problem. Perhaps another thing
to do is test playback in one of my binary builds of Shotcut.

> 10Sek samples at: https://www.dropbox.com/sh/t0nd097xmfn8907/fJy15kz1Pg
>
>
>
> avprobe version v0.8-4074-g4caa1bf, Copyright (c) 2007-2012 the Libav developers
>   built on Dec  3 2012 13:50:31 with llvm-gcc 4.2.1 (LLVM build 2336.9.00)
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '001_packtools/ZN1A0055.MOV':
>   Metadata:
>     major_brand     : qt
>     minor_version   : 537331968
>     compatible_brands: qt  CAEP
>     creation_time   : 2012-08-08 10:41:37
>   Duration: 00:00:18.08, start: 0.000000, bitrate: 30697 kb/s
>     Stream #0.0(eng): Video: h264 (High), yuvj420p, 1920x1080 [PAR 1:1 DAR 16:9], 29252 kb/s, 25 fps, 25 tbr, 25k tbn
>     Metadata:
>       creation_time   : 2012-08-08 10:41:37
>     Stream #0.1(eng): Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
>     Metadata:
>       creation_time   : 2012-08-08 10:41:37
>     Stream #0.2(eng): Data: tmcd / 0x64636D74, 0 kb/s
>     Metadata:
>       creation_time   : 2012-08-08 10:41:37
> Unsupported codec with id 0 for input stream 2
> # avprobe output
>
> best regards


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