Oh! Returning to my editor from replying to your last message, I suddenly saw
what I'm doing wrong.
The fix: I need to create a 2-frame sliding window that ping-pongs between this:
PTS=0 30030
: :
[a
On 2021-03-30 08:40, Bruce Roberts wrote:
Sorry to keep contradicting myself Mark Filipak, but I'm still wondering if
perhaps there is something wrong in your shuffle/mix/interleave command
because to me, having looked once again, ...
"Looked"? Have you run that filter_complex_script? I don't k
Sorry to keep contradicting myself Mark Filipak, but I'm still wondering if
perhaps there is something wrong in your shuffle/mix/interleave command
because to me, having looked once again, the output sequence doesn't appear
to included any weighted mixes of source frames 1 and 2 or 3 and 4, for
exa
> I believe that Nicolas is correct, Phil. I know that 24pps cinema is encoded
>at 24000/1001fps and> therefore running time is extended by about 0.4%.
Lots of cinema stuff is or at least was shot at 23.976, or at least that's the
way the frame rate is often labelled in the cameras.
The reason
Sorry - ignore what I said about the jumping back - I've had another look
and I was wrong about that.
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Hi Mark,
Thank you once again for that detailed explanation of your ingenious
solution! I think I finally understand it now (having spent a few hours
working through it) and I might also understand the leaping back behaviour:
It looks to me like your interleave filter will output the following
seq
Addition: I'm also not receiving Phil's posts (and perhaps others).
On 2021-03-29 18:19, Nicolas George wrote:
Phil Rhodes via ffmpeg-user (12021-03-29):
Are you contending that there is no such thing as video at 24000/1001 fps?
Are you capable of understanding a simple phrase made of less
On 2021-03-29 18:19, Nicolas George wrote:
Phil Rhodes via ffmpeg-user (12021-03-29):
Are you contending that there is no such thing as video at 24000/1001 fps?
Are you capable of understanding a simple phrase made of less ten words?
I believe that Nicolas is correct, Phil. I know that 24p
On 2021-03-29 07:11, Bruce Roberts wrote:
Yes, my apologies - I don't get the luminance bands either when I don't try
to deinterlace the progressive source or if I do deinterlace and
reinterlace interlaced inputs so it seems there was no problem with the
framerate filter after all.
I would still
I see we've entered Open Source World here, where everyone starts speaking in
tongues and obfuscating everything because...
...because...
...Um. I guess it's something to do with open source software, because nobody
seems to behave like this in professional-world.
P
On Monday, 29 March 2021,
Phil Rhodes via ffmpeg-user (12021-03-29):
> Are you contending that there is no such thing as video at 24000/1001 fps?
Are you capable of understanding a simple phrase made of less ten words?
--
Nicolas George
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Are you contending that there is no such thing as video at 24000/1001 fps?
On Monday, 29 March 2021, 22:08:03 BST, Nicolas George
wrote:
Phil Rhodes via ffmpeg-user (12021-03-29):
> What?
I have nothing to add to what I have written. Get a clue.
--
Nicolas George
_
Phil Rhodes via ffmpeg-user (12021-03-29):
> What?
I have nothing to add to what I have written. Get a clue.
--
Nicolas George
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On Monday, 29 March 2021, 19:03:43 BST, Nicolas George wrote:
Phil Rhodes via ffmpeg-user (12021-03-29):
>> For the sake of being really rigorously correct, yes, 24.0 or 24000/1001.
> Once again, you are wrong. The 1000/1001 factor is an artifact of color TV.
What?
24-frame material was of
Carl Zwanzig (12021-03-29):
> It's an artifact that is still used. Moreover, I've never met an broadcast
But it has nothing to do with movies. Unless movie studios have started
adding this factor on purpose.
> engineer who didn't write 29.97 or 23.97 (or "30fps drop-frame"); I think
> this is the
On 3/29/2021 11:03 AM, Nicolas George wrote:
Phil Rhodes via ffmpeg-user (12021-03-29):
For the sake of being really rigorously correct, yes, 24.0 or 24000/1001.
Once again, you are wrong. The 1000/1001 factor is an artifact of color
TV.
It's an artifact that is still used. Moreover, I've n
Phil Rhodes via ffmpeg-user (12021-03-29):
> For the sake of being really rigorously correct, yes, 24.0 or 24000/1001.
Once again, you are wrong. The 1000/1001 factor is an artifact of color
TV.
--
Nicolas George
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On Monday, 29 March 2021, 18:05:00 BST, Carl Zwanzig
wrote:
> Please be careful with the words- "movies" (made for theatrical release) are
> filmed at 24.0 fps.
For the sake of being really rigorously correct, yes, 24.0 or 24000/1001.
Makes very little difference to the current discus
Am Mo., 29. März 2021 um 18:48 Uhr schrieb Nicolas George :
>
> Carl Eugen Hoyos (12021-03-29):
> > Either you are showing content where the speed (and duration) can be
> > changed but this does not matter - such content is rare but likely
> > exists
>
> You mean that most movies from the NTSC area
On 3/29/2021 9:47 AM, Nicolas George wrote:
You mean that most movies from the NTSC area sold as PAL DVD likely
exist? I can confirm, they exist.
Please be careful with the words- "movies" (made for theatrical release) are
filmed at 24.0 fps. And pretty much anything committed to -film- will b
Carl Eugen Hoyos (12021-03-29):
> Either you are showing content where the speed (and duration) can be
> changed but this does not matter - such content is rare but likely
> exists
You mean that most movies from the NTSC area sold as PAL DVD likely
exist? I can confirm, they exist.
Regards,
--
Thank you both,
Intuitively, it didn't make sense to me either to change the speed AND
employ motion compensation so it's great to hear that you agree. That was
what I was driving at when I asked if I should treat 24000/1001 differently
to 3/1001 and you've confirmed that I do.
So I think I've
On 3/29/2021 8:41 AM, Carl Eugen Hoyos wrote:
If you go from 24000/1001 or 24 to 25, it should be acceptable to
change the speed, just force an input framerate of 25 and change
the audio pitch.
Agreed; in PAL broadcast territory that's been the accepted practice for
many (70? 80?) years (and I
Am Mo., 29. März 2021 um 10:44 Uhr schrieb Bruce Roberts :
> The background to this is that I have to transcode 23.976fps and 29.97fps
> content for a VOD platform that will only accept 25fps. Their
> documentation says that *prefer *speed change when going from 23.976fps
> or 24fps to 25fps but t
Yes, my apologies - I don't get the luminance bands either when I don't try
to deinterlace the progressive source or if I do deinterlace and
reinterlace interlaced inputs so it seems there was no problem with the
framerate filter after all.
I would still be very interested to hear any optimisation
... actually, I've just realised that I'm being a doofus. That source is
progressive. Sorry - I'll test again with an interlaced source.
>
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Hi again Carl,
I've done another test and have uploaded both the input and output files
(which shows the luminance bands problem near the bottom of the output
picture) here:
https://drive.google.com/drive/folders/1YTUNHm4_oIZFfGge-JqlDT0c71ioLulY?usp=sharing
Here is my command and the console out
Hi Mark,
Many thanks for the detailed reply - it does indeed sound like we're
treading parallel paths although, to be quite honest, I don't fully
understand your mix/decimate method. It sounds very promising though so I
very much look forward to seeing your working filter!
Thanks again,
Bruce.
Hi Carl,
Many thanks for your response. The background to this is that I have to
transcode 23.976fps and 29.97fps content for a VOD platform that will only
accept 25fps. Their documentation says that *prefer *speed change when
going from 23.976fps or 24fps to 25fps but that they also require motio
On 2021-03-26 10:02, Bruce Roberts wrote:
Hello,
I'm looking for advice on the best ways to convert 23.976fps and 29.97fps
AVC-I 100Mbps content to 25fps (also interlaced AVC-I 100Mbps).
Hello Bruce,
I think we may be treading parallel paths, you: from the west to east (FILM & NTSC to 50fps),
Am Fr., 26. März 2021 um 15:32 Uhr schrieb Bruce Roberts :
> I'm looking for advice on the best ways to convert 23.976fps
> and 29.97fps AVC-I 100Mbps content to 25fps
The single most important question is:
What do you mean with "convert"?
Usually, changing the speed of the video is completely
u
Hello,
I'm looking for advice on the best ways to convert 23.976fps and 29.97fps
AVC-I 100Mbps content to 25fps (also interlaced AVC-I 100Mbps).
So far I have tried the fps filter as follows:
ffmpeg \
-i 23_967.mxf \
-filter_complex "[0:v:0]fps=fps=25[v25fps]" \
-map "[v25fps]" -map a: -codec
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