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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