[mythtv] Re: nuvexport mpeg2cut doesn't work on dvb-t mpeg

[George Styles]

Just a heads up, but are you using big enough dvb sample files? when I use 
tcprobe on dvb files, it often required a scan of 100meg or more to actually 
find the segments it wanted.

g

----- Original Message ----- 
From: "Thomas Husemann" <thomas at thusemann.dyndns.org>
To: "Development of mythtv" <mythtv-dev at mythtv.org>
Sent: Friday, November 19, 2004 9:13 AM
Subject: Re: [mythtv] Re: nuvexport mpeg2cut doesn't work on dvb-t mpeg


> Hi Gavin,
>
> the difference between dvb-t and ivtv is the "workbench" file for 
> avidemux:
>
> ADMW0002 (dvb-t)
> 01 videos
> Name : /mnt/store/1016_20041119082000_20041119082100.nuv.idx
> 0 segments
> Audio codec : none
> Audio filter : audioNormalizeMode=0 audioResampleMode=0 audioDRC=0
> audioShift=0
> audioDelay=0 audioFreq=48000
> Audio conf : audioProcessMode=0 audioMP3mode=0 audioMP3bitrate=128
>
> ADMW0002 (ivtv)
> 01 videos
> Name : /data/mythtv/1020_20041119093100_20041119093300.nuv.idx
> 1 segments
> Start : 517
> Size : 5029
> Ref :   0
> Audio codec : none
> Audio filter : audioNormalizeMode=0 audioResampleMode=0 audioDRC=0
> audioShift=0
> audioDelay=0 audioFreq=48000
> Audio conf : audioProcessMode=0 audioMP3mode=0 audioMP3bitrate=128
>
> ...hope that helps
>
> Regards
>
> Thomas
>
> Gavin Hurlbut schrieb:
>> Thomas Husemann <thomas at thusemann.dyndns.org> wrote:
>>
>>>I tried to cut my recording with nuexport. The recording was produced by
>>>dvb-t card (AverMedia DVB-T 771). First problem was the Xvfb server. My
>>>solution:
>>
>>
>> Oh fun.  :)
>>
>>
>>>-    ${XVFB} :13 -screen 0 640x480x8 2> /dev/null > /dev/null &
>>>+    ${XVFB} :13 -ac -screen 0 640x480x8 2> /dev/null > /dev/null &
>>
>>
>> Hmmm.  Disabling access controls...  I guess that's not a bad idea.  I'll 
>> work
>> that in.  I also had someone else who needed to run in 24 colour mode for 
>> soem
>> reason, so I'll likely put that in too.
>>
>>
>>>mpeg2cut /mnt/store/1006_20041117101800_20041117104500.nuv "./King of
>>>Queens -In Flagranti".mpg  2521-18637 30102-45445 45537-
>>
>>
>> OK, there's the first problem.  Seems that myth isn't putting in GOP 
>> frame
>> indexes into the database for your video.  Without that, we have no idea 
>> what
>> the last frame number will be, and hence we can't cut...
>>
>> Soooo.  Could you get me a dump of *one* show's worth of recordedmarkups
>> database entries?  You'd need to be handy with SQL, and preferrably use a 
>> short
>> recording.  Please email it to me directly.
>>
>>
>>>mpeg2cut v1.6
>>>Using mode Xvfb
>>>Filename "/mnt/store/1006_20041117101800_20041117104500.nuv"
>>>OutFile "./King of Queens -In Flagranti.mpg"
>>>Last GOP index 2521-18637
>>
>>
>> Baaaaad. :)
>>
>>
>>>*more debug* (with set -x and stderror)
>>
>>
>> Ahhh, learn something new every day.
>>
>>
>>>  720 x 576 at 25000 fps
>>> >>>Other PTS = 3208911210
>>
>>
>>>  could not get sync!
>>
>>
>>>**error reading packet**
>>
>>
>>>  io error , aborting sync
>>
>>
>>>  end of stream...
>>
>>
>> Also bad...   Seems avidemux barfs on your MPEG files.  It seems that 
>> maybe
>> Myth isn't actually generating a proper MPEG2-PS file from the MPEG2-TS 
>> stream
>> perhaps?  Hard to tell so far.
>>
>>
>> If it can't index, it's game over.
>>
>>
>>>*tcprobe from mpegstream*
>>
>>
>>>[tcprobe] MPEG program stream (PS)
>>>[tcprobe] summary for /mnt/store/1006_20041117101800_20041117104500.nuv,
>>>(*) = not default, 0 = not detected
>>>import frame size: -g 720x576 [720x576]
>>>      aspect ratio: 4:3 (*)
>>>        frame rate: -f 25.000 [25.000] frc=3
>>>                    PTS=35655.2287, frame_time=40 ms, bitrate=15000 kbps
>>>       audio track: -a 0 [0] -e 48000,16,2 [48000,16,2] -n 0x50 [0x2000] 
>>> (*)
>>>                    PTS=35654.5690, bitrate=192 kbps
>>>                    -D 16 --av_fine_ms 19 (frames & ms) [0] [0]
>>>detected (3) presentation unit(s) (SCR reset)
>>
>>
>> Hmmm.  3 presentation units?  Interesting, never seen that with my ivtv
>> generated files.
>>
>> I do have some test recordings to test with tonight, so I'll see if I can 
>> dig
>> anything up.
>>
>> In the mean-time, it looks like mpeg2cut will not work for your 
>> recordings.
>> Hold on a few days, I'll try to fix that. :)
>>
>> Ciao
>> Gavin
>>
>>
>>
>>>Any suggestions ?
>>
>>
>>>Regards
>>
>>
>>>Thomas
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> ------------------------------------------------------------------------
>>
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>> mythtv-dev at mythtv.org
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>
>


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