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