Mailing List Archive: MythTV: Users

bad HDTV playback with new ffmpeg

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krose+mythtv at krose

Jan 4, 2005, 10:48 PM

Post #1 of 12 (3707 views)
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bad HDTV playback with new ffmpeg

Three users unsuccessfully attempted to download the mpeg fragment
that I posted today that demonstrates (on two of my machines) a
difference between pre-Dec 24 and post-Dec 24 ffmpeg sync-ups when
using Xv output. I was working with a new dmz config that didn't have
the mpeg in my public_html directory. Here's the link again:

http://www.krose.org/~krose/krose-cbs.mpg

Let me know if there are any problems.

Cheers,
Kyle

krose+mythtv at krose

Jan 5, 2005, 11:40 AM

Post #2 of 12 (3554 views)
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Re: bad HDTV playback with new ffmpeg [In reply to]

So I notice that 6 people downloaded the full length of this:

> http://www.krose.org/~krose/krose-cbs.mpg

Is anyone else seeing the same weird effect I am when using Xv output?

Keep in mind that this is happening to me on two different machines
(one a dual Opteron running in 64 bit mode, the other a P4 HT, each
with different audio chipsets), the main relevant commonality being
that they are both using NVidia FX video cards with the 6629 driver.

I've only seen it so far with CBS football broadcasts, and nothing
else. Even other 1080i content (e.g., ABC football broadcasts) looks
fine.

Cheers,
Kyle

joebarnhart at yahoo

Jan 5, 2005, 1:18 PM

Post #3 of 12 (3563 views)
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Re: bad HDTV playback with new ffmpeg [In reply to]

--- Kyle Rose <krose+mythtv [at] krose> wrote:

> I've only seen it so far with CBS football
> broadcasts, and nothing
> else. Even other 1080i content (e.g., ABC football
> broadcasts) looks
> fine.

Are you sure ABC broadcasts 1080i in your area? I'm
pretty sure they broadcast MNF in 720p here in the
S.F. Bay Area. AFAIK the 1080i stations here are CBS,
NBC, and PBS. The 720p stations include ABC and FOX.

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krose+mythtv at krose

Jan 5, 2005, 1:33 PM

Post #4 of 12 (3581 views)
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Re: bad HDTV playback with new ffmpeg [In reply to]

Joe Barnhart <joebarnhart [at] yahoo> writes:

> --- Kyle Rose <krose+mythtv [at] krose> wrote:
>
>
>> I've only seen it so far with CBS football
>> broadcasts, and nothing
>> else. Even other 1080i content (e.g., ABC football
>> broadcasts) looks
>> fine.
>
> Are you sure ABC broadcasts 1080i in your area? I'm
> pretty sure they broadcast MNF in 720p here in the
> S.F. Bay Area. AFAIK the 1080i stations here are CBS,
> NBC, and PBS. The 720p stations include ABC and FOX.

I checked the backend log when the recording started, and it said
1080. FWIW, PBS HD (which is definitely 1080i) also works fine.

Kyle

doug at ties

Jan 5, 2005, 5:07 PM

Post #5 of 12 (3602 views)
Permalink

Re: bad HDTV playback with new ffmpeg [In reply to]

My playback of this clip is definitely weird... playback speed seems to
oscillate about 2 times a second. Deinterlacing or not doesn't seem to
make much of a difference.

-Doug

Attachments:

signature.asc (0.25 KB)

krose+mythtv at krose

Jan 5, 2005, 5:22 PM

Post #6 of 12 (3579 views)
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Re: bad HDTV playback with new ffmpeg [In reply to]

Doug Larrick <doug [at] ties> writes:

> My playback of this clip is definitely weird... playback speed seems to
> oscillate about 2 times a second. Deinterlacing or not doesn't seem to
> make much of a difference.

Thank you for the confirmation.

So, I guess I just happen to be the only one with a local affiliate
broadcasting ATSC that's confusing the myth player. Wonderful. :/

Cheers,
Kyle

funaho at jurai

Jan 5, 2005, 5:32 PM

Post #7 of 12 (3547 views)
Permalink

Re: bad HDTV playback with new ffmpeg [In reply to]

Kyle Rose wrote:
> Doug Larrick <doug [at] ties> writes:
>
>
>>My playback of this clip is definitely weird... playback speed seems to
>>oscillate about 2 times a second. Deinterlacing or not doesn't seem to
>>make much of a difference.
>
>
> Thank you for the confirmation.
>
> So, I guess I just happen to be the only one with a local affiliate
> broadcasting ATSC that's confusing the myth player. Wonderful. :/

Well I don't think it's just HDTV because I get this too ever since I
upgraded to current CVS, and I'm running a PVR350. Video going fast and
slow, sound skipping like mad...basically unwatchable. Still trying to
nail it down...the suggestion of backing libavcodec back down to the
12/24 version didn't seem to help me either.
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krose+mythtv at krose

Jan 5, 2005, 5:57 PM

Post #8 of 12 (3578 views)
Permalink

Re: bad HDTV playback with new ffmpeg [In reply to]

> Well I don't think it's just HDTV because I get this too ever since
> I upgraded to current CVS, and I'm running a PVR350. Video going
> fast and slow, sound skipping like mad...basically
> unwatchable. Still trying to nail it down...the suggestion of
> backing libavcodec back down to the 12/24 version didn't seem to
> help me either.

Given that I'm not using a hardware MPEG decoder (for which libavcodec
does nothing), I think (a) these are probably disparate problems and
(b) libavcodec probably doesn't have anything to do with your
problem. Can you think of anything else you changed when you upgraded
to the new CVS? Downgrading should help if that's the case. What
version of ivtv are you using?

Cheers,
Kyl

funaho at jurai

Jan 5, 2005, 6:21 PM

Post #9 of 12 (3611 views)
Permalink

Re: bad HDTV playback with new ffmpeg [In reply to]

Kyle Rose wrote:
>>Well I don't think it's just HDTV because I get this too ever since
>>I upgraded to current CVS, and I'm running a PVR350. Video going
>>fast and slow, sound skipping like mad...basically
>>unwatchable. Still trying to nail it down...the suggestion of
>>backing libavcodec back down to the 12/24 version didn't seem to
>>help me either.
>
>
> Given that I'm not using a hardware MPEG decoder (for which libavcodec
> does nothing), I think (a) these are probably disparate problems and
> (b) libavcodec probably doesn't have anything to do with your
> problem. Can you think of anything else you changed when you upgraded
> to the new CVS? Downgrading should help if that's the case. What
> version of ivtv are you using?

Actually I'm not using the decoder on the PVR350, just the encoder right
now. Decoding is software to a Geforce FX card, driver version 6111
(which I've been running for ages now.) I'm running ivtv 0.2.0-rc3c,
which was running for several days before I upgraded Myth so I'm sure
it's not that either (not that should matter since I'm not using
hardware decoding.)

Nothing else was changed at the time I upgraded Myth. I was running CVS
from around thanksgiving (11/22 if I'm not mistaken) and upgraded to
01/04. Subsequently backed down libs/libavcodec to 12/24 as per another
post I saw on this exact same problem but still get the weirdness.

I've thought about backing down to the previous version since I still
have the RPMs I made but I stupidly forgot to backup my database and now
the schema has upgraded. I'm not worried about it though; it's still
recording all my shows for me and I can live without TV for a while. :)

Hmm on the bright side I *finally* got MythMusic working. That's a
definite plus...it never worked for me until today.
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krose+mythtv at krose

Jan 5, 2005, 6:58 PM

Post #10 of 12 (3558 views)
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Re: bad HDTV playback with new ffmpeg [In reply to]

> Actually I'm not using the decoder on the PVR350, just the encoder right
> now. Decoding is software to a Geforce FX card, driver version 6111
> (which I've been running for ages now.) I'm running ivtv 0.2.0-rc3c,
> which was running for several days before I upgraded Myth so I'm sure
> it's not that either (not that should matter since I'm not using
> hardware decoding.)

Okay, that makes more sense: it could be a similar or related problem,
but given that mine is solved by backing ffmpeg out to 24-Dec, I doubt
it's exactly the same problem. Can you put up for download a clip (50
MB or less) I can view?

Cheers,
Kyle

james at thearmstrongs

Jan 6, 2005, 5:00 AM

Post #11 of 12 (3560 views)
Permalink

Re: bad HDTV playback with new ffmpeg [In reply to]

>>
>>> My playback of this clip is definitely weird... playback speed seems
>>> to oscillate about 2 times a second. Deinterlacing or not doesn't
>>> seem to make much of a difference.
>>
>>
>>
>> Thank you for the confirmation.
>>
>> So, I guess I just happen to be the only one with a local affiliate
>> broadcasting ATSC that's confusing the myth player. Wonderful. :/
>
>
> Well I don't think it's just HDTV because I get this too ever since I
> upgraded to current CVS, and I'm running a PVR350. Video going fast
> and slow, sound skipping like mad...basically unwatchable. Still
> trying to nail it down...the suggestion of backing libavcodec back
> down to the 12/24 version didn't seem to help me either.
> ________________________________________

I have the same problem since updating a few days ago. HDTV playback is
not smooth. Does not jump around much, just slows down briefly. I get
Prebuffer Pauses in the log when it happens. I tried the 12/24 version
of the libavcodec tree but that did not help. Using a P4 3G HT with 1Gig
memory and NVidia.

- James
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funaho at jurai

Jan 7, 2005, 7:29 AM

Post #12 of 12 (3552 views)
Permalink

Re: bad HDTV playback with new ffmpeg [In reply to]

Kyle Rose wrote:
> Okay, that makes more sense: it could be a similar or related problem,
> but given that mine is solved by backing ffmpeg out to 24-Dec, I doubt
> it's exactly the same problem. Can you put up for download a clip (50
> MB or less) I can view?

Here is the first 25 megs of an older clip that used to play before the
update but now produces the problem. I figure using an older clip like
this will be sure to rule out some weird problems with the input from
the ivtv drivers.

http://tokimi.jurai.org/~funaho/test.nuv

What I get when I try to play it is a brief "spurt" of high-speed video
(at least double speed if not faster) plus some audio; then the video
pauses for a moment, the audio skips ahead and the whole cycle repeats.
Thinking it might be related to audio changes I tried syncing the audio
output portion of libmyth back to 11/15 (my last working version) but it
didn't help. I also tried enabling "Use video as timebase" with no result.

I have more memory showing up for this machine today so that compiling
on it won't be so painful, and then I will try some more combinations
including syncing libavcodec back to 11/15. Can anyone think of any
other bits of code I should try reverting as well?
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