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<div class="moz-cite-prefix">On 9/28/2013 3:33 AM, Mark Perkins
wrote:<br>
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<blockquote type="cite"><span>On 28 Sep 2013, at 6:07 pm, "John
Pilkington" <<a moz-do-not-send="true"
href="mailto:J.Pilk@tesco.net">J.Pilk@tesco.net</a>>
wrote:</span><br>
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<blockquote type="cite"><span>On 28/09/13 04:26, Mark Perkins
wrote:</span><br>
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<blockquote type="cite"><span>On 28 Sep 2013, at 3:58 am,
"John Finlay" <<a moz-do-not-send="true"
href="mailto:finlay@moeraki.com">finlay@moeraki.com</a>>
wrote:</span><br>
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<blockquote type="cite"><span>On 9/27/2013 11:11 AM,
Raymond Wagner wrote:</span><br>
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<blockquote type="cite"><span>On 9/27/2013 12:40 PM,
John Finlay wrote:</span><br>
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<blockquote type="cite"><span>Since lossless transcode
in 0.27 seems broken in my tests what alternatives
do you use to losslessly cut out commercials, etc.?</span><br>
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<blockquote type="cite"><span>Is this a recent issue? It
was working fine for me a few months back on the 0.27
developmental builds.</span><br>
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<blockquote type="cite"><span>Recent for me since I just
upgraded to 0.27 and tried the lossless transcode. For
example the original file is seen by ffmpeg like:</span><br>
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<blockquote type="cite"><span>Input #0, mpegts, from
'1071_20130925050000.mpg':</span><br>
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<blockquote type="cite"><span> Duration: 00:59:57.84, start:
8442.162544, bitrate: 10573 kb/s</span><br>
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<blockquote type="cite"><span> Stream #0.0[0x31]: Video:
mpeg2video (Main), yuv420p, 1920x1080 [PAR 1:1 DAR
16:9], 13216 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94
tbc</span><br>
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<blockquote type="cite"><span> Stream #0.1[0x34](eng):
Audio: ac3, 48000 Hz, 5.1, s16, 384 kb/s</span><br>
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<blockquote type="cite"><span> Stream #0.2[0x35](spa):
Audio: ac3, 48000 Hz, mono, s16, 128 kb/s (visual
impaired)</span><br>
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<blockquote type="cite"><span>and after the lossless
transcode:</span><br>
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<blockquote type="cite"><span>Input #0, mpeg, from
'1071_20130925050000.mpg':</span><br>
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<blockquote type="cite"><span> Duration: 37:10:28.62, start:
0.316133, bitrate: 191 kb/s</span><br>
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<blockquote type="cite"><span> Stream #0.0[0x1e0]: Video:
mpeg2video (Main), yuv420p, 1920x1080 [PAR 1:1 DAR
16:9], 13216 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94
tbc</span><br>
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<blockquote type="cite"><span> Stream #0.1[0x80]: Audio:
ac3, 48000 Hz, 5.1, s16, 384 kb/s</span><br>
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<blockquote type="cite"><span> Stream #0.2[0x81]: Audio:
ac3, 48000 Hz, mono, s16, 128 kb/s (visual impaired)</span><br>
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<blockquote type="cite"><span>[Mark] I had that exact problem
on 0.26 (I assume by lossless transcode you mean
mythtranscode). Searching previous threads I couldn't find
a solution although there did seem to be a small number of
people with the same issue. I gave up (after 100's of hrs
of testing different things - I just couldn't nail it
down) and ended up moving to dvbcut (I think it's called
from memory) with the projectx cut switch. Note that
dvbcut is not frame accurate. I haven't re-tried since
moving to 0.27 but it is on the list of things to do. I
also tried lossless_cut but always ended up with audio /
video out of sync.</span><br>
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<blockquote type="cite"><span>It wasn't clear to me what bad
effects you were seeing, although clearly ffmpeg has a
problem with the final bitrate.</span><br>
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<span>[Mark] Yes, I didn't specify. I think it is actually
mostly now getting covered in the other thread (</span><a
moz-do-not-send="true"
href="http://www.mythtv.org/pipermail/mythtv-users/2013-September/354074.html">http://www.mythtv.org/pipermail/mythtv-users/2013-September/354074.html</a>)-
but incorrect bit rate and subsequent processing failing. On a
file that had commercials cut using mythtranscode:</div>
<div><span>- ProjectX would terminate randomly at one of the cuts
and only partially output.</span><br>
<span>- Handbrake would occasionally (1 in 3) output a file with
no video</span><br>
<span>- AVIDemux would produce file with audio / video sync
progressively deteriorating. 25min show with only 2 cuts was
not too bad but by the end of a 2hr movie with lots of
commercials it might be nearly 1sec different.</span><br>
<span>If I recall correctly MythTV would play the mythtranscoded
file with no issue, it was only post processing that caused
all the headaches although as said before the bit rate
metadata appeared corrupted.</span><br>
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I'm beginning to think that mythtranscode has been intentionally
changed to still work with mythtv but to make post-processing of the
losslessly transcoded file impossible. Even mythffmpeg can't process
the cut files.<br>
<br>
John<br>
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