On Tue, Jun 23, 2015 at 3:17 PM Rob Hallam <rob...@roberthallam.com> wrote:
> melt by default seems to produce h264-encoded videos using the 'High'
> profile; I would like to encode using the 'Main' profile. However,
> supplying profile=main, vprofile=main or even profile=Main or other
>
vprofile targets the video codec instead of all libavformat objects (audio
codec and muxer).
> profiles causes errors (as well as an incorrect file):
>
Messages are not necessarily errors. How do you know it is incorrect?
>
> $ melt test1.mkv test2.mkv -mix 120 -mixer luma -consumer
> avformat:test-transition.mp4 crf=18 profile=main
> (snip)
> [libx264 @ 0x7f0bd00c7a20] [Eval @ 0x7f0bff71d0f0] Undefined constant
> or missing '(' in 'main'
>
MLT passes all options to ffmpeg libs as strings, and ffmpeg supports
expressions as values. Here it seems to be trying to evaluate the string
"main" as an expression.
> [libx264 @ 0x7f0bd00c7a20] Unable to parse option value "main"
>
I do not know why libx264 complains about this - maybe a side effect of
above. Run melt with -verbose and you will see something like:
[libx264 @ 0x7ff7cd011200] profile Main, level 3.1
> [libfaac @ 0x7f0bd00c8ec0] [Eval @ 0x7f0bff71d0a0] Undefined constant
> or missing '(' in 'main'
> [libfaac @ 0x7f0bd00c8ec0] Unable to parse option value "main"
>
You did not specify profile as a video-only option, and libfaac accepts a
profile option as well, but it does not accept "main."
> [libfaac @ 0x7f0bd00c8ec0] Channel layout not specified
>
>
Specify one if you want, but 2 channels is assumed to be stereo.
> (setting vprofile=main instead causes there to be no complaints from
> libfaac)
>
> you see?
> Searching for similar output yields old ffmpeg posts from ca 2011 when
> there were changes to their -profile handling. The only relatively
> contemporaneous results I could find related to this is
>
> http://forums.debian.net/viewtopic.php?f=6&t=117482
>
> although that was noted fixed in libmlt6 0.9.2-2 in Debian sid. For what
> it's worth, x264 --help reports available profiles as
> "baseline,main,high,high10,high422,high444".
>
> All that said I have a feeling I may be invoking melt incorrectly. I tried
> looking for an IRC channel, but #mlt no longer exists on irc.gimp.net and
> #mlt on Freenode seems to have a worldwide +b !
>
>
> Thanks in advance,
> Rob
>
>
>
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