[Interest] mirroring and reversing QMovie

Frank Rueter | OHUfx frank at ohufx.com
Thu Jul 14 05:42:21 CEST 2016

Yeah, true.
It may not be an issue though, as this is to preview a bunch of small, 
animated thumbnails of fairly short video clips for a library interface, 
not for playing back long, high resolution, high quality movies.

However, if there are ideas on how to make this more efficient I'd be 
more than happy to learn.
This is what I got for so far:


On 07/14/2016 12:18 PM, Thiago Macieira wrote:
> Em quinta-feira, 14 de julho de 2016, às 11:41:12 PDT, Frank Rueter | OHUfx
> escreveu:
>> Thanks.
>> What I'm currently exploring is using QImageReader, caching the frames
>> via read() and basically implementing basic play back functions with
>> timers in a custom paintEvent. That way I should have full control over
>> which image is displayed when.
>> Probably won't be the most efficient considering my lack of experience
>> with those sort of things but I will cross that bridge when I get there :)
> No, it's not.
> You're basically describing MJPEG, a movie format made up of a sequence of
> JPEG-compressed frames. That's older than and produces movies that are less
> well compressed than MPEG1, which in turn is older than MPEG 2 (used on DVDs
> and most of the world's digital TV broadcasts), which is older than MPEG 4,
> which in turn is not as efficient than MPEG 4 Advanced Video Codec a.k.a. H.264.
> You'll get none of the improvements made over the last 20 years of video
> coding.

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