Re: [PD] [GEM] output gemwin to video file workaround using ffmpeg on macos

[Andre Osku Schmidt]

On Thu, 28 May 2020 16:33:41 -0400
ffdd cchh  wrote:

> Hi everyone,
> 
> Is it possible to grab the OpenGL stream

try https://github.com/apitrace/apitrace





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Re: [PD] [GEM] output gemwin to video file workaround using ffmpeg on macos

[Johnny Mauser via Pd-list]

For me on OSX syphon + syphon recorder works best.

Antoine Villeret  schrieb am Fr., 29. Mai 2020,
10:54:

> Hi,
>
> what about using a screen casting tool ? they are usually made for gaming
> and thus optimized for real time performance.
> On macos, quicktime player is a pretty simple solution for that.
> The only drawback I saw is that you're stuck with the rendering window
> size since the tool grab a part of the screen, you can't render at a bigger
> resolution than the display's one.
>
> My 2 cents
>
> A
>
> Le ven. 29 mai 2020 à 10:05, cyrille henry  a écrit :
>
>> hello,
>> The open GL rendering is made in the GPU. grabbing the images by the CPU
>> in order to compress them and to record them in the HDD is a slow operation.
>> I think some software are able to compress the image in the GPU in order
>> to grab a smaller file, but Gem don't.
>> So, there is not a lot's of solution, and you already found them.
>>
>> I use pix_record when I need a correct quality of a small video. I use
>> mjpa with good result.
>>
>> When I need better quality, I use pix_writer. Usually this can not be
>> made in real time. I.E : I create a process that render exactly what I
>> want, without human interaction. (For live performance, I record all human
>> interaction in tables or texts file during the performance, then I use this
>> data to play again the same performance)
>> Then, It's possible to record both image annd sound in the same time.
>> Even if pd will not be sync with real (external) time, the time inside pd
>> will still stay consistent. I.E : even if there are lot's of audio dropout
>> and the recording fps is 1/2 of the real fps, pd will still record a
>> perfect audio file that will be perfectly sync with the video. You just
>> need to start the audio and video recording with the same "bang".
>>
>>
>> cheers
>> Cyrille
>>
>> Le 28/05/2020 à 22:33, ffdd cchh a écrit :
>> > Hi everyone,
>> >
>> > Is it possible to grab the OpenGL stream with ffmpeg and save to a
>> video file? If so, could anyone point in the right direction as to how to
>> capture the stream opened by Gem?
>> >
>> > The reason I ask this is that I am looking for ways to render video
>> frames to a file and I have not managed a good result using neither
>> [pix_record] nor [pix_writer].
>> >
>> > With [pix_record] I have systematically tried all codecs and
>> colorspaces and I had no luck.
>> >
>> > With [pix_writer], I did manage high quality frames with the correct
>> colorspace which I then concatenated into a video (with ffmpeg). The
>> drawback I have with [pix_writer] is the time it takes to write, which
>> really complicates audio and video synching.
>> >
>> > Thanks!!
>> >
>> > Fede
>> > --
>> > fdch.github.io 
>> >
>> > ___
>> > Pd-list@lists.iem.at mailing list
>> > UNSUBSCRIBE and account-management ->
>> https://lists.puredata.info/listinfo/pd-list
>> >
>>
>>
>>
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Re: [PD] [GEM] output gemwin to video file workaround using ffmpeg on macos

[Antoine Villeret]

Hi,

what about using a screen casting tool ? they are usually made for gaming
and thus optimized for real time performance.
On macos, quicktime player is a pretty simple solution for that.
The only drawback I saw is that you're stuck with the rendering window size
since the tool grab a part of the screen, you can't render at a bigger
resolution than the display's one.

My 2 cents

A

Le ven. 29 mai 2020 à 10:05, cyrille henry  a écrit :

> hello,
> The open GL rendering is made in the GPU. grabbing the images by the CPU
> in order to compress them and to record them in the HDD is a slow operation.
> I think some software are able to compress the image in the GPU in order
> to grab a smaller file, but Gem don't.
> So, there is not a lot's of solution, and you already found them.
>
> I use pix_record when I need a correct quality of a small video. I use
> mjpa with good result.
>
> When I need better quality, I use pix_writer. Usually this can not be made
> in real time. I.E : I create a process that render exactly what I want,
> without human interaction. (For live performance, I record all human
> interaction in tables or texts file during the performance, then I use this
> data to play again the same performance)
> Then, It's possible to record both image annd sound in the same time. Even
> if pd will not be sync with real (external) time, the time inside pd will
> still stay consistent. I.E : even if there are lot's of audio dropout and
> the recording fps is 1/2 of the real fps, pd will still record a perfect
> audio file that will be perfectly sync with the video. You just need to
> start the audio and video recording with the same "bang".
>
>
> cheers
> Cyrille
>
> Le 28/05/2020 à 22:33, ffdd cchh a écrit :
> > Hi everyone,
> >
> > Is it possible to grab the OpenGL stream with ffmpeg and save to a video
> file? If so, could anyone point in the right direction as to how to capture
> the stream opened by Gem?
> >
> > The reason I ask this is that I am looking for ways to render video
> frames to a file and I have not managed a good result using neither
> [pix_record] nor [pix_writer].
> >
> > With [pix_record] I have systematically tried all codecs and colorspaces
> and I had no luck.
> >
> > With [pix_writer], I did manage high quality frames with the correct
> colorspace which I then concatenated into a video (with ffmpeg). The
> drawback I have with [pix_writer] is the time it takes to write, which
> really complicates audio and video synching.
> >
> > Thanks!!
> >
> > Fede
> > --
> > fdch.github.io 
> >
> > ___
> > Pd-list@lists.iem.at mailing list
> > UNSUBSCRIBE and account-management ->
> https://lists.puredata.info/listinfo/pd-list
> >
>
>
>
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Re: [PD] [GEM] output gemwin to video file workaround using ffmpeg on macos

[cyrille henry]

hello,
The open GL rendering is made in the GPU. grabbing the images by the CPU in 
order to compress them and to record them in the HDD is a slow operation.
I think some software are able to compress the image in the GPU in order to 
grab a smaller file, but Gem don't.
So, there is not a lot's of solution, and you already found them.

I use pix_record when I need a correct quality of a small video. I use mjpa 
with good result.

When I need better quality, I use pix_writer. Usually this can not be made in 
real time. I.E : I create a process that render exactly what I want, without 
human interaction. (For live performance, I record all human interaction in 
tables or texts file during the performance, then I use this data to play again 
the same performance)
Then, It's possible to record both image annd sound in the same time. Even if pd will not 
be sync with real (external) time, the time inside pd will still stay consistent. I.E : 
even if there are lot's of audio dropout and the recording fps is 1/2 of the real fps, pd 
will still record a perfect audio file that will be perfectly sync with the video. You 
just need to start the audio and video recording with the same "bang".


cheers
Cyrille

Le 28/05/2020 à 22:33, ffdd cchh a écrit :

Hi everyone,

Is it possible to grab the OpenGL stream with ffmpeg and save to a video file? 
If so, could anyone point in the right direction as to how to capture the 
stream opened by Gem?

The reason I ask this is that I am looking for ways to render video frames to a 
file and I have not managed a good result using neither [pix_record] nor 
[pix_writer].

With [pix_record] I have systematically tried all codecs and colorspaces and I 
had no luck.

With [pix_writer], I did manage high quality frames with the correct colorspace 
which I then concatenated into a video (with ffmpeg). The drawback I have with 
[pix_writer] is the time it takes to write, which really complicates audio and 
video synching.

Thanks!!

Fede
--
fdch.github.io 

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[PD] [GEM] output gemwin to video file workaround using ffmpeg on macos

[ffdd cchh]

Hi everyone,

Is it possible to grab the OpenGL stream with ffmpeg and save to a video
file? If so, could anyone point in the right direction as to how to capture
the stream opened by Gem?

The reason I ask this is that I am looking for ways to render video frames
to a file and I have not managed a good result using neither [pix_record]
nor [pix_writer].

With [pix_record] I have systematically tried all codecs and colorspaces
and I had no luck.

With [pix_writer], I did manage high quality frames with the correct
colorspace which I then concatenated into a video (with ffmpeg). The
drawback I have with [pix_writer] is the time it takes to write, which
really complicates audio and video synching.

Thanks!!

Fede
-- 
fdch.github.io
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