[mythtv-users] Mythtv - dropping frames in FC1, pvr250mce

[Rob Henry]

Further, I tried shutting off the preview, but no change.

I'm also finding, that if I record a 30 minute show, Myth reports it as
being only 14 minutes, so half the frames are being lost. It's obviously
during capture somehow. 


Here's my test_ioctl -a

ioctl: IVTV_IOC_G_CODEC
Codec parameters
aspect      : 2
audio       : 0x00a9
bframes     : 3
bitrate_mode: 0
bitrate     : 6000000
bitrate_peak: 8000000
dnr_mode    : 0
dnr_spatial : 0
dnr_temporal: 0
dnr_type    : 0
framerate   : 0
framespergop: 15
gop_closure : 0
pulldown    : 0
stream_type : 0
ioctl: VIDIOC_G_FMT
        Type   : Video Capture
        Width  : 720
        Height : 480
ioctl: VIDIOC_QUERYCAP
        Driver name   : ivtv
        Card type     : Vanilla iTVC15 card
        Bus info      : 0
        Driver version: 265
        Capabilities  : 0x01030011
ioctl: VIDIOC_ENUMINPUT
        Name    : Composite 0
        Type    : 0x00000002
        Audioset: 0x00000001
        Tuner   : 0x00000000
        Standard: 0x            3000 ( NTSC
        Status  : 0
        Name    : Composite 1
        Type    : 0x00000002
        Audioset: 0x00000001
        Tuner   : 0x00000000
        Standard: 0x            3000 ( NTSC
        Status  : 0
        Name    : Composite 2
        Type    : 0x00000002
        Audioset: 0x00000001
        Tuner   : 0x00000000
        Standard: 0x            3000 ( NTSC
        Status  : 0
        Name    : Composite 3
        Type    : 0x00000002
        Audioset: 0x00000001
        Tuner   : 0x00000000
        Standard: 0x            3000 ( NTSC
        Status  : 0
        Name    : Tuner 0
        Type    : 0x00000001
        Audioset: 0x00000000
        Tuner   : 0x00000000
        Standard: 0x            3000 ( NTSC
        Status  : 0
        Name    : Composite 4
        Type    : 0x00000002
        Audioset: 0x00000001
        Tuner   : 0x00000000
        Standard: 0x            3000 ( NTSC
        Status  : 0
        Name    : S-Video 0
        Type    : 0x00000002
        Audioset: 0x00000001
        Tuner   : 0x00000000
        Standard: 0x            3000 ( NTSC
        Status  : 0
        Name    : S-Video 1
        Type    : 0x00000002
        Audioset: 0x00000001
        Tuner   : 0x00000000
        Standard: 0x            3000 ( NTSC
        Status  : 0
        Name    : S-Video 2
        Type    : 0x00000002
        Audioset: 0x00000001
        Tuner   : 0x00000000
        Standard: 0x            3000 ( NTSC
        Status  : 0
        Name    : S-Video 3
        Type    : 0x00000002
        Audioset: 0x00000001
        Tuner   : 0x00000000
        Standard: 0x            3000 ( NTSC
        Status  : 0
ioctl: VIDIOC_G_INPUT
Input = 4
ioctl: VIDIOC_G_FREQUENCY
Frequency = 2804
ioctl: VIDIOC_ENUMSTD
        ID          : 0x            3000
        Name        : NTSC
        Frame period: 1001/30000
        Frame lines : 525
        ID          : 0x              FF
        Name        : PAL
        Frame period: 1/25
        Frame lines : 625
        ID          : 0x          7F0000
        Name        : SECAM
        Frame period: 1/25
        Frame lines : 625
ioctl: VIDIOC_G_STD
Standard = 0x00003000
ioctl: VIDIOC_QUERYCTRL
Brightness = 127
Contrast = 63
Saturation = 63
Hue = 0
Volume = 58950
Mute = 0


-----Original Message-----
From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Rob Henry
Sent: Thursday, May 27, 2004 6:58 PM
To: 'Discussion about mythtv'
Subject: RE: [mythtv-users] Mythtv - dropping frames in FC1, pvr250mce 

Apologies. I use a pvr250 MCE version not "240"

-----Original Message-----
From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Rob Henry
Sent: Thursday, May 27, 2004 1:09 AM
To: 'Discussion about mythtv'
Subject: [mythtv-users] Mythtv - dropping frames in FC1, pvr240mce 

Hello,

I'm using Mythtv.15 installed mostly by using by using Jarod's guide.
It's on a Soyo sy-7vba133u with a p3 1 ghz processor and 512 megabytes
of ram.  I'm using a Geforce 440mx for the TV out using the Nvidia
drivers and ivtv 0.1.10pre2 for capture. Naitive alsa for sound.
Everything's working okay so far except for one thing.

It seems to be systematically dropping frames resulting in choppy
playback. I'm sure it has to do with capture. I'm unable to get the
recorded video to play in windows to be sure, but when I go to the watch
recordings menu, the preview window shows the video sped up. This could
be an indication. Also I've tried all the playback options (experimental
timebase av sync, jitter reduction, extra buffering etc) and it always
ends up the video pausing about 5 seconds in to the point where I can't
do anything. I have to restart mythfrontend. But those few seconds speak
volumes. I turn on av/sync and the sound eventually cracks up in a few
seconds and the playback is too fast. If I try and do jitter reduction
and the playback seems smooth but very fast, but the sound goes in and
out until it crashes. If I do use video as a time base, the sound goes
in and out after a bit and the video seems to be going normal speed but
with dropped frames. Other setting combinations lead to the program's
demise after a few seconds.

I've tried everything I can think of but it seems that my video files
are missing frames, and while it plays okay, it's slightly choppy. Could
this be a ivtv problem or a sound problem? I've looked around but can't
seem to find this answer. 

Thanks for all your guys help in advance. This is my 1st question,
asked, but I've had a million questions answered so far.

-Robert