[mythtv-users] Transcoding SD MPEG2 to H.264---recommendations?
D. R. Newman
d.r.newman at e-consultation.org
Mon Nov 29 13:19:03 UTC 2010
On 29/11/10 08:52, f-myth-users at media.mit.edu wrote:
> However---the result was unusable. The activity log was crammed full
> of "audio 192 time went backwards 0 ms, dropped 1 frames" and "video
> time didn't advance - dropped 1 frames" lines, and about halfway
> through the transcode, it suddenly went from claiming it had 20
> minutes to go, to done. (It also said "sync: got 26887 frames, 60691
> expected", which might explain a thing or two.) And the result, as you
> might expect, was a jumpy mess.
> I have no idea why this didn't work.
One possibility is that the source file contains lots of errors. I
normally remultiplex everything before conversion. I use ProjectX to
demultiplex a recording into separate sound and video files, then mplex
to put them back together, synchronising the sound and video at the same
time. ProjectX is pretty good at detecting and tidying up errors in
recordings. I find that this even makes a difference on DVB-T digital
I actually run ProjectX and mplex from a script (attached). But to do
that, you need to compile ProjectX to run without a GUI, otherwise it
tries to pop up an Xwindow owned by mythtv. So you may want to start by
manually using ProjectX and mplex, then try Handbrake/Avidemux or
whatever on the resulting file.
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