The normalizing filters are intended to be attached to the individual
producers, not the playlist itself.
It isn't the intention for the programmer to manually add the normalizers. They
are added by the factory when the "service:resource" notation us used (as you
use in your example code).
>From my inspection of your code (I did not try to run it), the normalizers
>should be getting added correctly.
You could try passing the profile to the playlist. But that is just a guess.
~Brian
On Friday, July 21, 2023 at 03:45:16 AM CDT, Rickard Lindberg
<rick...@rickardlindberg.me> 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
<rick...@rickardlindberg.me> 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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