> On 4/25/07, Duncan Webb <[EMAIL PROTECTED]> wrote:
>> > On 3/15/07, Tom Weichmann <[EMAIL PROTECTED]> wrote:
>> > I don't have any problems with my aspect ratio, but it looks like the
>> > frames or fields are getting played out of order. When things move
>> > they look very jerky. This doesn't happen before I start freevo.
>> > Afterwards the video is "stuck" that way. I tried to see which
>> > settings freevo is changing, but the only one I could find, I found in
>> > the code and changed it (it was the 0x3000 setting for NTSC which is
>> > 0x1000 by default) it didn't fix the issue.
>> >
>> > I really hope there is a solution to this problem.
>>
>> TV_IVTV_OPTIONS = {
>> 'input' : 0,
>> 'resolution' : '720x480',
>> 'aspect' : 2, // in 1.7.0 change this to 1
>> 'audio_bitmask' : 233,
>> 'bframes' : 3, // in 1.7.0 change this to 2
>> 'bitrate_mode' : 0,
>> 'bitrate' : 6000000,
>> 'bitrate_peak' : 9000000, // default is 8600000
>> 'dnr_mode' : 0,
>> 'dnr_spatial' : 0,
>> 'dnr_temporal' : 8,
>> 'dnr_type' : 0,
>> 'framerate' : 0,
>> 'framespergop' : 15, // the default is 12
>> 'gop_closure' : 1,
>> 'pulldown' : 0,
>> 'stream_type' : 0,
>> }
>>
>> There is a small bug in freevo-1.7.0, which is fixed in svn, that sets
>> aspect and bframes one higher than the ivtv drivers < 0.8.0. Why this
>> should make the recording jerky is possibly a bug in the firmware.
>>
>> Technical explanation
>>
>> The ivtv drivers < 0.8.0 simply uses the setting as defined in the
>> firmware api. ivtv drivers >= 0.8.0 translate the setting to more
>> logical
>> settings.
>>
>> aspect=2 set the recording to 16x9, ivtv drivers < 0.8.0 set the
>> recording
>> aspect to 4x3.
>>
>> bframes=3 gives 3 b-frames between i and p-frames, ivtv drivers < 0.8.0
>> put 2 b-frames between.
>>
>> 3 b-frames doesn't make sense with a framespergop of 15,
>> (iBBBpBBBpBBBpBBi) as one b-frame is missing. When 2 is used then
>> (iBBpBBpBBpBBpBBi) then everything add up.
>>
>> IIRC i was using a framespergop=12 and the recordings were still jerky
>> with 3 b-frames, this should be ok but isn't.
>>
>> Solution is to either update to the latest svn version *or* change:
>> 'aspect' : 1,
>> ...
>> 'bframes' : 2,
>>
>> Hopefully there are no other translated values
>>
>> Duncan
>>
>
>
> Changing the b-frames as described above fixed the problem for me.
> Thank you so much for your help. It's amazing that the problem could
> be that simple to fix, and yet, I never tried changing it to that. I
> think I tried setting bframes to 0 at one point, which also didn't
> work. Since I didn't know which of those values was wrong, it would
> have taken me forever to just fiddle with them one at a time until I
> got it right.
>
> Thanks for your help, Duncan!
Really the thanks should go to Justin Wetherell he found the correct
settings. Then it was easy to find the bug.
When freevo-1.7.1 comes out, this weekend, the settings will need to be
changed back. ie:
'aspect' : 2,
...
'bframes' : 3,
What's still foxing me a bit is why the PVR-500 had smooth recordings and
the PVR-350 had jerky recordings.
And why the quality of the PVR-500 recordings is noticeably lower than the
PVR-350.
I wonder if anybody else has has a PVR-500 and has noticed that the live
tv through freevo is not as the direct tv.
Cheers,
Duncan
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