[Kdenlive-devel] exposing parallelism

[Till Theato]

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On 02/16/2011 08:04 PM, Dan Dennedy wrote:
> On Wed, Feb 16, 2011 at 8:15 AM, Till Theato <root at ttill.de> wrote:
> On 02/16/2011 09:11 AM, Dan Dennedy wrote:
>>>> I want to expose parallelism in Kdenlive. There are basically three settings:
>>>>

[...]

> 
>>>> encoding threads belongs on the Render dialog (along with bitrate).
>>>> Even though it does not always apply - only some encoders handle it -
>>>> it should not bother other encoders. Thoughts?
> 
> Maybe the profiles could have a flag indicating their support.
> Additionally a flag regarding bitrate support (+ some presets) and one
> for 2 pass would make our profiles.xml a lot easier to maintain.
> 
>> Also good suggestion about the flags.
> 
> We would then for example have only one MPEG-4 profile with a spinbox
> 
>> heh, yep, but that leaves room to add things like GOP size, B-frames,
>> qscale, motion estimation method, and all sorts of interesting ffmpeg
>> options.
> 
> for the number of threads, a editable combobox for the bitrate and a
> checkbox for 2 pass.
> 
> Of course on a larger scale there could be done much more to the
> rendering dialog ...
> 
>> I think bitrate, passes, and threads will go a long, long way. I do

Done in the meantime. However I have a problem with the WebM profiles
since they use a maxrate which obviously is different for every bitrate.
I guess it cannot be dropped? Currently the low quality profiles have
maxrate = 3*bitrate while the high quality ones have maxrate =
2*bitrate. Any ideas for a general rule? It could be evaluated using
QScriptEngine.

>> not think we need to get carried away with changes here, but there are
>> 2 other big problems based on support feedback. The Destination combo
>> is way too easy to overlook. Also, does anyone ever use the Format
>> combo? Letting someone choose PAL with a non-25-fps project or NTSC
>> with a non-29.97 project is just inviting trouble - these are known
>> limitations. We need to remove it and also disable the strict PAL- or
>> NTSC-formats (DV, HDV) if the project does not match: another flag to

jbm did this recently. Thanks!

>> add in the profiles.xml. Subsequently, we can move the Destination
>> combo to the current location of Format. Alternatively, we can make
>> the Format list contain folders like the Effect list.
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