I use melt 7.4.0, which came with my Linux Mint.
I'm not sure whether I found a bug, a feature ;-) but I found it
very strange.
I use MLT with XML (mlt) files, and some presents in dv_custom file.
Let's assume I'd like to make a movie with an image and an audio. I
have two separate files: one PNG, and one m4a (audio). Here's my XML
file:
<mlt>
<producer id="audio" resource="file.m4a" />
<producer id="img" resource="file.png" />
<playlist id="clip-video">
<entry producer="img" in="0" out="500" />
</playlist>
<playlist id="clip-audio">
<entry producer="audio" in="10000" out="10500" />
</playlist>
<tractor id="track">
<multitrack>
<track producer="clip-video" />
<track producer="clip-audio" />
</multitrack>
</tractor>
</mlt>
It can be rendered to mp4 with the command:
melt file.xml -consumer avformat:"video.mp4" acodec=aac vcodec=libx265 \
width=1280 height=720 frame_rate_num=30 frame_rate_den=1 frequency=48000 \
progressive=1 display_aspect_num=16 display_aspect_den=9 \
sample_aspect_num=1 sample_aspect_den=1
And the produced video.mp4 file is fine.
When I use SDL consumer, though:
melt file.xml
the audio is out-of-sync with the clip-audio specified in the XML file.
I have found a weird workaround for that problem, though. When I make
a short video sequence from the PNG file:
melt file.png out=30 -consumer avformat:"file.mp4" vcodec=libx265 \
width=1280 height=720 frame_rate_num=30 frame_rate_den=1 \
progressive=1 display_aspect_num=16 display_aspect_den=9 \
sample_aspect_num=1 sample_aspect_den=1
and use a single frame from this video in XML file, instead of PNG
file producer:
<mlt>
<producer id="audio" resource="file.m4a" />
<producer id="frame-workaround" mlt_service="hold" resource="file.mp4"
frame="1" />
<playlist id="clip-video">
<entry producer="frame-workaround" in="0" out="500" />
</playlist>
<playlist id="clip-audio">
<entry producer="audio" in="10000" out="10500" />
</playlist>
<tractor id="track">
<multitrack>
<track producer="clip-video" />
<track producer="clip-audio" />
</multitrack>
</tractor>
</mlt>
everything is fine in both rendered video.mp4, and in the SDL
preview/consumer.
Is it a problem with SDL consumer, or am I doing something wrong?
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