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
>>> <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
>>>
>>> _______________________________________________
>>> Mlt-devel mailing list
>>> Mlt-devel@lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/mlt-devel
>>
>>
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>>
>
>
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