Yeah. That is a good point. You would need to add a transition so that the
transparent is blended with the red. I guess it is not a perfect work around.
~Brian
On Monday, July 24, 2023 at 12:17:45 AM CDT, Rickard Lindberg
<[email protected]> wrote:
Hmm.
Do I need to add some kind of transition for the transparent color to have any
effect?
I expected both of these to generate 100 (or 101?) red frames:
$ mlt-melt -track color:red in=0 out=100 -track color:transparent in=0 out=100
$ mlt-melt -track color:transparent in=0 out=100 -track color:red in=0 out=100
But the first one only shows black frames for me.
/Rickard
On Mon, Jul 24, 2023, at 06:48, Rickard Lindberg wrote:
Thanks for your support! This workaround works fine for me.
/Rickard
On Sun, Jul 23, 2023, at 00:22, Brian Matherly wrote:
> mlt-melt color:red in=0 out=25 -blank 25 color:blue in=0 out=25 -consumer
> avformat target=/tmp/export.mp4
Thanks for the example command. I reproduce this and I confirm it is a bug. I
have filed it here:
https://github.com/mltframework/mlt/issues/931
As a workaround, you can use transparent clips instead of blank:
mlt-melt color:red in=0 out=25 color:transparent in=0 out=25 color:blue in=0
out=25 -consumer avformat target=/tmp/export.mp4
~Brian
On Friday, July 21, 2023 at 04:30:59 AM CDT, Rickard Lindberg
<[email protected]> wrote:
I managed to reproduce the problem with melt:
$ mlt-melt color:red in=0 out=25 -blank 25 color:blue in=0 out=25 -consumer
avformat target=/tmp/export.mp4
+-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+
|1=-10| |2= -5| |3= -2| |4= -1| |5= 0| |6= 1| |7= 2| |8= 5| |9= 10|
+-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+
+---------------------------------------------------------------------+
| H = back 1 minute, L = forward 1 minute |
| h = previous frame, l = next frame |
| g = start of clip, j = next clip, k = previous clip |
| 0 = restart, q = quit, space = play |
+---------------------------------------------------------------------+
[libx264 @ 0x7fe9d80023c0] interlace + weightp is not implemented
[mp4 @ 0x7fe9d8000f40] Using AVStream.codec to pass codec parameters to muxers
is deprecated, use AVStream.codecpar instead.
[mp4 @ 0x7fe9d8000f40] Using AVStream.codec to pass codec parameters to muxers
is deprecated, use AVStream.codecpar instead.
[aac @ 0x7fe9d8004e40] Input contains (near) NaN/+-Inf
[consumer avformat] error with audio encode: -22 (frame 28)
[aac @ 0x7fe9d8004e40] Input contains (near) NaN/+-Inf
[consumer avformat] error with audio encode: -22 (frame 28)
[aac @ 0x7fe9d8004e40] Input contains (near) NaN/+-Inf
[consumer avformat] error with audio encode: -22 (frame 29)
[aac @ 0x7fe9d8004e40] 5 frames left in the queue on closing
Current Position: 28
/Rickard
On Fri, Jul 21, 2023, at 10:44, Rickard Lindberg wrote:
If I attach the audioconvert filter like this, the export works:
playlist.attach(mlt.Filter(profile, "audioconvert"))
When loading the xml, this filter seems to be attached automatically, along
with avcolor_space. But it is not set for the playlist that I create.
Should I wrap my playlist in something so that the loader can do its thing? Or
should I add these filters manually?
/Rickard
On Thu, Jul 20, 2023, at 22:19, Rickard Lindberg wrote:
I tried to generate an XML file using the "xml" consumer and got this:
<?xml version="1.0"?>
<mlt LC_NUMERIC="C" version="6.26.1" producer="playlist0">
<profile description="DV/DVD PAL" width="720" height="576" progressive="0"
sample_aspect_num="16" sample_aspect_den="15" display_aspect_num="4"
display_aspect_den="3" frame_rate_num="25" frame_rate_den="1" colorspace="601"/>
<producer id="producer0" in="0" out="14999">
<property name="length">15000</property>
<property name="eof">pause</property>
<property name="resource">red</property>
<property name="aspect_ratio">1.06667</property>
<property name="mlt_service">color</property>
</producer>
<producer id="producer1" in="0" out="14999">
<property name="length">15000</property>
<property name="eof">pause</property>
<property name="resource">green</property>
<property name="aspect_ratio">1.06667</property>
<property name="mlt_service">color</property>
</producer>
<playlist id="playlist0">
<entry producer="producer0" in="0" out="25"/>
<blank length="26"/>
<entry producer="producer1" in="0" out="25"/>
</playlist>
</mlt>
Melt seems to be able to render this just fine using
mlt-melt test.xml -consumer avformat target=export.mp4 acodec=aac
So my guess is that I need to do something different in my code. Question is
what...
/Rickard
On Thu, Jul 20, 2023, at 22:16, Brian Matherly wrote:
Your MLT is over 2 years old. Can you try with a newer version?
Also, it would be helpful to reproduce with a melt command so that others can
easily recreate the problem.
~Brian
On Thursday, July 20, 2023 at 03:00:45 PM CDT, Rickard Lindberg
<[email protected]> wrote:
Hi,
I'm having trouble exporting a playlist that contains blanks. Here is a small
program to reproduce the problem:
mlt.Factory().init()
profile = mlt.Profile()
playlist = mlt.Playlist()
playlist.append(mlt.Producer(profile, "color:red"), 0, 25)
playlist.blank(25)
playlist.append(mlt.Producer(profile, "color:green"), 0, 25)
consumer = mlt.Consumer(profile, "avformat")
consumer.set("target", "export.mp4")
consumer.connect(playlist)
consumer.start()
while consumer.is_stopped() == 0:
time.sleep(1)
The output:
[libx264 @ 0x7f61740023c0] interlace + weightp is not implemented
[mp4 @ 0x7f6174000f40] Using AVStream.codec to pass codec parameters to
muxers is deprecated, use AVStream.codecpar instead.
[mp4 @ 0x7f6174000f40] Using AVStream.codec to pass codec parameters to
muxers is deprecated, use AVStream.codecpar instead.
[aac @ 0x7f6174004e40] Input contains (near) NaN/+-Inf
[consumer avformat] error with audio encode: -22 (frame 28)
[aac @ 0x7f6174004e40] Input contains (near) NaN/+-Inf
[consumer avformat] error with audio encode: -22 (frame 28)
[aac @ 0x7f6174004e40] Input contains (near) NaN/+-Inf
[consumer avformat] error with audio encode: -22 (frame 29)
[aac @ 0x7f6174004e40] 5 frames left in the queue on closing
Without
playlist.blank(25)
the export works fine.
I assumed that if no producer exist to produce sound, silence will be used. Is
that assumption wrong? Do I need to insert a producer for silence? Or is this
an issue with the aac encoder?
Versions:
mlt: 6.26.1
ffmpeg: 4.4.1
/Rickard
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