[mythtv-users] Lossless Cut (mythcommflag vs mythtranscode)
Angela
angela.schmid at wolke7.net
Mon May 6 19:17:55 UTC 2013
> All three tools (the recorder, mythcommflag --rebuild, and mythtranscode
--
> buildindex) produce seektables in the same place, namely the recordedseek
> table for recordings and the filemarkup table for videos. If mythcommflag
is
> not producing any seektable entries, one possibility is that the
underlying
> ffmpeg is crashing on the file, which is not unheard of. You might be
able to
> detect this by running it from the debugger. If not, it would help to get
> access to the video file in question.
I was playing around with the newest lossless cut scripts (PPAs as 20130506)
and noticed that the cut video was always 3-4 keyframes earlier.
Thought I could fix it with mythcommflag and mythtranscode (0.26-fixes as
20130503), so I rerun both and noticed with an interlaced recording that
mythtranscode sets the marks to double the keyframes.
Seektable made with mythtranscode cannot be used for lossless_cut.
What could be the cause that the output of lossless_cut is 3-4 keyframes too
early ?
I noticed on the same file, when using a 1 minute cut, the output file
duration is correct, when it is around 40 minutes the duration in the mkv
file is more than 17 hours.
This could be easily fixed with http://www.mkvrepair.com/, any idea what
could be the cause ?
Angela
Mythcommflag:
10017 2012-09-29 01:55:00 0 0 9
10017 2012-09-29 01:55:00 28 2122708 9
10017 2012-09-29 01:55:00 56 3327788 9
10017 2012-09-29 01:55:00 84 4577424 9
10017 2012-09-29 01:55:00 112 5760508 9
10017 2012-09-29 01:55:00 140 6996232 9
10017 2012-09-29 01:55:00 172 8274444 9
10017 2012-09-29 01:55:00 200 9378192 9
10017 2012-09-29 01:55:00 240 10984088 9
10017 2012-09-29 01:55:00 268 12396156 9
10017 2012-09-29 01:55:00 296 13715164 9
10017 2012-09-29 01:55:00 324 15650812 9
10017 2012-09-29 01:55:00 368 18347296 9
10017 2012-09-29 01:55:00 388 19492968 9
10017 2012-09-29 01:55:00 424 21757052 9
Mythtranscode:
10017 2012-09-29 01:55:00 55 939812 9
10017 2012-09-29 01:55:00 111 2122708 9
10017 2012-09-29 01:55:00 167 3327788 9
10017 2012-09-29 01:55:00 223 4577424 9
10017 2012-09-29 01:55:00 279 5760508 9
10017 2012-09-29 01:55:00 335 6996232 9
10017 2012-09-29 01:55:00 399 8274444 9
10017 2012-09-29 01:55:00 455 9378192 9
<track type="Video">
<ID>60 (0x3C)</ID>
<Menu_ID>1 (0x1)</Menu_ID>
<Format>AVC</Format>
<Format_Info>Advanced Video Codec</Format_Info>
<Format_profile>High at L4.0</Format_profile>
<Format_settings__CABAC>Yes</Format_settings__CABAC>
<Format_settings__ReFrames>3 frames</Format_settings__ReFrames>
<Format_settings__GOP>M=4, N=28</Format_settings__GOP>
<Codec_ID>27</Codec_ID>
<Duration>57mn 57s</Duration>
<Bit_rate>8 534 Kbps</Bit_rate>
<Width>1 920 pixels</Width>
<Height>1 080 pixels</Height>
<Display_aspect_ratio>16:9</Display_aspect_ratio>
<Frame_rate>25.000 fps</Frame_rate>
<Standard>Component</Standard>
<Color_space>YUV</Color_space>
<Chroma_subsampling>4:2:0</Chroma_subsampling>
<Bit_depth>8 bits</Bit_depth>
<Scan_type>Interlaced</Scan_type>
<Scan_order>Top Field First</Scan_order>
<Bits__Pixel_Frame_>0.165</Bits__Pixel_Frame_>
<Stream_size>3.46 GiB (91%)</Stream_size>
<Color_primaries>BT.709</Color_primaries>
<Transfer_characteristics>BT.709</Transfer_characteristics>
<Matrix_coefficients>BT.709</Matrix_coefficients>
</track>
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