A Windows XP help forum. PCbanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » PCbanter forum » Microsoft Windows 7 » Windows 7 Forum
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

WMC Recording video



 
 
Thread Tools Rate Thread Display Modes
  #1  
Old November 13th 18, 10:01 AM posted to alt.windows7.general
pjp[_10_]
external usenet poster
 
Posts: 1,183
Default WMC Recording video


I've a fairly good working WMC uses a Hauppage usb tv tuner almost
perfectly. The only problem seems to be audio/video goes out of sync
playing back recorded videos. This doesn't happen watching live tv.
Happage's own WinTV recordings don't seem to exibit this issue.

I've basically given up using Google for help as even links that do lead
to the problem no one seems to have any concrete ideas for a solution so
asking here.
Ads
  #2  
Old November 13th 18, 12:20 PM posted to alt.windows7.general
J. P. Gilliver (John)[_4_]
external usenet poster
 
Posts: 2,679
Default WMC Recording video

In message , pjp
writes:

I've a fairly good working WMC uses a Hauppage usb tv tuner almost
perfectly. The only problem seems to be audio/video goes out of sync
playing back recorded videos. This doesn't happen watching live tv.
Happage's own WinTV recordings don't seem to exibit this issue.


When you say _goes_ out of sync, do you mean that it starts in sync but
they then slip by an increasing amount the longer you watch, or that it
always has an offset?

I've basically given up using Google for help as even links that do lead
to the problem no one seems to have any concrete ideas for a solution so
asking here.


[I know what you mean. )-:]
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

Q. How much is 2 + 2?
A. Thank you so much for asking your question.
Are you still having this problem? I'll be delighted to help you. Please
restate the problem twice and include your Windows version along with
all error logs.
- Mayayana in alt.windows7.general, 2018-11-1
  #3  
Old November 13th 18, 05:18 PM posted to alt.windows7.general
NY
external usenet poster
 
Posts: 586
Default WMC Recording video

"Wolf K" wrote in message
...
Several players have adjustments for syncing audio/video, e.g, Media
Player Classic.


When sound and vision are out of sync by a small amount, I find it very
difficult to work out which one is leading the other and therefore whether
to make a positive or negative adjustment. If you can apply it to playing
video, it's a lot easier than if you have to stop the video, adjust it, play
it a bit more, stop it, adjust it etc.

  #6  
Old November 13th 18, 08:46 PM posted to alt.windows7.general
Bill in Co
external usenet poster
 
Posts: 1,927
Default WMC Recording video

pjp wrote:
In article ,
says...

On 2018-11-13 11:18, NY wrote:
"Wolf K" wrote in message
...
Several players have adjustments for syncing audio/video, e.g, Media
Player Classic.

When sound and vision are out of sync by a small amount, I find it very
difficult to work out which one is leading the other and therefore
whether to make a positive or negative adjustment. If you can apply it
to playing video, it's a lot easier than if you have to stop the video,
adjust it, play it a bit more, stop it, adjust it etc.


True, that would be a nice feature.


VLC allows you to adjust sync pos or neg amount as it plays, Works
easily and well. However that's not a solution for problem but just a
work-around. I can also use VirtualDub and try to sync to audio and
video but the problem is the offset is not constant but changes as the
video plays, e.g. audio becomes increasingly out of sync with video.


And I think the only solution to this is to demultiplex the audio and video
tracks, and then either shorten or lengthen the audio track's time duration
(which is a tedious trial and error process to get it in sync), and then
remultiplex it back in with the video. I've done this with mp4 files, and
it is indeed a tedious process to get it in sync. As I recall, the human ear
can detect around 100 ms offset in the audio-video sync.


  #7  
Old November 13th 18, 08:56 PM posted to alt.windows7.general
NY
external usenet poster
 
Posts: 586
Default WMC Recording video

"pjp" wrote in message
...
In article ,
says...

On 2018-11-13 11:18, NY wrote:
"Wolf K" wrote in message
...
Several players have adjustments for syncing audio/video, e.g, Media
Player Classic.

When sound and vision are out of sync by a small amount, I find it very
difficult to work out which one is leading the other and therefore
whether to make a positive or negative adjustment. If you can apply it
to playing video, it's a lot easier than if you have to stop the video,
adjust it, play it a bit more, stop it, adjust it etc.


True, that would be a nice feature.


VLC allows you to adjust sync pos or neg amount as it plays, Works
easily and well. However that's not a solution for problem but just a
work-around. I can also use VirtualDub and try to sync to audio and
video but the problem is the offset is not constant but changes as the
video plays, e.g. audio becomes increasingly out of sync with video.


All you can do is divide a recording into chunks (maybe at advert breaks)
and set a different delay for each chunk, and then join them back together.
You can at least use VLC as the means of tweaking the delay till it seems
right, and then reading what delay you've found to be necessary, so you can
apply it to the recording using VideoRedo or VirtualDub. A bit of a nuisance
if you have to do it for all/most recordings.

When I used to use WMC for recording, I didn't have a problem with sync,
apart from very occasional recordings. I wonder if sync delay is affected
more by the software you use or by the make/model of DVB/ATSC decoder. If
it's software-dependent, you could try using a package such as NextPVR
instead of WMC for making your recordings. I used to use NextPVR because it
could record more than one overlapping programme per multiplex which WMC
unaccountably can't do - you need two tuners if you want to record two
overlapping programmes.

I now use TVHeadend on a Raspberry Pi (which I also use for logging data
from a weather station) because it uses so much less power than leaving a
Windows PC on 24/7.

  #8  
Old November 13th 18, 09:27 PM posted to alt.windows7.general
Paul[_32_]
external usenet poster
 
Posts: 11,873
Default WMC Recording video

pjp wrote:
I've a fairly good working WMC uses a Hauppage usb tv tuner almost
perfectly. The only problem seems to be audio/video goes out of sync
playing back recorded videos. This doesn't happen watching live tv.
Happage's own WinTV recordings don't seem to exibit this issue.

I've basically given up using Google for help as even links that do lead
to the problem no one seems to have any concrete ideas for a solution so
asking here.


That seemed to be a problem in some versions of Windows 10.

https://helgeklein.com/blog/2017/03/...realtek-sound/

Maybe some of the ideas there would help.

Paul
  #9  
Old November 13th 18, 09:46 PM posted to alt.windows7.general
pjp[_10_]
external usenet poster
 
Posts: 1,183
Default WMC Recording video

In article ,
says...

"pjp" wrote in message
...
In article ,

says...

On 2018-11-13 11:18, NY wrote:
"Wolf K" wrote in message
...
Several players have adjustments for syncing audio/video, e.g, Media
Player Classic.

When sound and vision are out of sync by a small amount, I find it very
difficult to work out which one is leading the other and therefore
whether to make a positive or negative adjustment. If you can apply it
to playing video, it's a lot easier than if you have to stop the video,
adjust it, play it a bit more, stop it, adjust it etc.

True, that would be a nice feature.


VLC allows you to adjust sync pos or neg amount as it plays, Works
easily and well. However that's not a solution for problem but just a
work-around. I can also use VirtualDub and try to sync to audio and
video but the problem is the offset is not constant but changes as the
video plays, e.g. audio becomes increasingly out of sync with video.


All you can do is divide a recording into chunks (maybe at advert breaks)
and set a different delay for each chunk, and then join them back together.
You can at least use VLC as the means of tweaking the delay till it seems
right, and then reading what delay you've found to be necessary, so you can
apply it to the recording using VideoRedo or VirtualDub. A bit of a nuisance
if you have to do it for all/most recordings.

When I used to use WMC for recording, I didn't have a problem with sync,
apart from very occasional recordings. I wonder if sync delay is affected
more by the software you use or by the make/model of DVB/ATSC decoder. If
it's software-dependent, you could try using a package such as NextPVR
instead of WMC for making your recordings. I used to use NextPVR because it
could record more than one overlapping programme per multiplex which WMC
unaccountably can't do - you need two tuners if you want to record two
overlapping programmes.

I now use TVHeadend on a Raspberry Pi (which I also use for logging data
from a weather station) because it uses so much less power than leaving a
Windows PC on 24/7.


I'm checking out Hauppages own WinTv software as I write. I'll check 1/2
hr recording and if it's in sync then good bye WMC for recording
purposes. I'm curious to see file size given WMC creates an 8 Gb file
for an hour recording!!!

I can't be bothered trying to alter sync after the fact. It's only a tv
show for my wife when there's a conflict between two shows at same time
she'd like to watch. Anything more elaborate and it's easier to just
download from a torrent and then you have no ads etc. either.

I'm waiting to receive an external TV Tuner outputs HDMI, Composite and
co-axial. It also takes a USB drive and docs state you can use it as a
PVR. Assuming that does it's job properly and the file format is
something at least semi-common then that's likely a more dependable
means of achieving recording. Maybe I'll let ya's know after it comes
and I try it out.
  #10  
Old November 13th 18, 10:30 PM posted to alt.windows7.general
pjp[_10_]
external usenet poster
 
Posts: 1,183
Default WMC Recording video

In article ,
says...

In article ,
says...

"pjp" wrote in message
...
In article ,

says...

On 2018-11-13 11:18, NY wrote:
"Wolf K" wrote in message
...
Several players have adjustments for syncing audio/video, e.g, Media
Player Classic.

When sound and vision are out of sync by a small amount, I find it very
difficult to work out which one is leading the other and therefore
whether to make a positive or negative adjustment. If you can apply it
to playing video, it's a lot easier than if you have to stop the video,
adjust it, play it a bit more, stop it, adjust it etc.

True, that would be a nice feature.

VLC allows you to adjust sync pos or neg amount as it plays, Works
easily and well. However that's not a solution for problem but just a
work-around. I can also use VirtualDub and try to sync to audio and
video but the problem is the offset is not constant but changes as the
video plays, e.g. audio becomes increasingly out of sync with video.


All you can do is divide a recording into chunks (maybe at advert breaks)
and set a different delay for each chunk, and then join them back together.
You can at least use VLC as the means of tweaking the delay till it seems
right, and then reading what delay you've found to be necessary, so you can
apply it to the recording using VideoRedo or VirtualDub. A bit of a nuisance
if you have to do it for all/most recordings.

When I used to use WMC for recording, I didn't have a problem with sync,
apart from very occasional recordings. I wonder if sync delay is affected
more by the software you use or by the make/model of DVB/ATSC decoder. If
it's software-dependent, you could try using a package such as NextPVR
instead of WMC for making your recordings. I used to use NextPVR because it
could record more than one overlapping programme per multiplex which WMC
unaccountably can't do - you need two tuners if you want to record two
overlapping programmes.

I now use TVHeadend on a Raspberry Pi (which I also use for logging data
from a weather station) because it uses so much less power than leaving a
Windows PC on 24/7.


I'm checking out Hauppages own WinTv software as I write. I'll check 1/2


I just did a 1/2 hour recording using Haupagges own WinTV software.
Flawless with perfect lip sync all the way thru file even after
converted from ".ts" format to "Xvid/MP3" format. Guess that's what I'll
use to record with although kinda like WMC more in a general way.
  #11  
Old November 14th 18, 10:53 PM posted to alt.windows7.general
NY
external usenet poster
 
Posts: 586
Default WMC Recording video

"pjp" wrote in message
...
I'm checking out Hauppages own WinTv software as I write. I'll check 1/2
hr recording and if it's in sync then good bye WMC for recording
purposes. I'm curious to see file size given WMC creates an 8 Gb file
for an hour recording!!!


Blimey! 8 GB for a 1-hour recording? Is that for SD or HD?

Recording from BBC One in the UK (DVB-T), a 1-hour recording is about 1.5
GB. ITV (the leading commercial channel) is quite a lot less: about 900
GB/hour. That for 720x576x25 SD (European spec), with DVB subtitles and two
sound streams (programme sound and audio description for the blind). I would
imagine that 640x480x30 (US spec) would be fairly similar. So if you are
getting 8 GB/hour, then the broadcasters must either be adding a lot of
extra streams or else only lightly compressing the signal.

HD (1920x1080x25 H264) uses more bandwidth. The recent broadcast of They
Shall Not Grow Old (colourised WWI film) is 4.1 GB for 1h 35m. But H264 is a
more efficient means of encoding, so quality is better for an equivalent
bitrate. If HD was broadcast using MPEG2 with same degree of compression as
SD, you'd expect it to be about 1.5 * (1920 x 1080 / (720x576) or 7.5
GB/hour.

  #12  
Old November 15th 18, 12:17 AM posted to alt.windows7.general
pjp[_10_]
external usenet poster
 
Posts: 1,183
Default WMC Recording video

In article ,
says...

"pjp" wrote in message
...
I'm checking out Hauppages own WinTv software as I write. I'll check 1/2
hr recording and if it's in sync then good bye WMC for recording
purposes. I'm curious to see file size given WMC creates an 8 Gb file
for an hour recording!!!


Blimey! 8 GB for a 1-hour recording? Is that for SD or HD?

Recording from BBC One in the UK (DVB-T), a 1-hour recording is about 1.5
GB. ITV (the leading commercial channel) is quite a lot less: about 900
GB/hour. That for 720x576x25 SD (European spec), with DVB subtitles and two
sound streams (programme sound and audio description for the blind). I would
imagine that 640x480x30 (US spec) would be fairly similar. So if you are
getting 8 GB/hour, then the broadcasters must either be adding a lot of
extra streams or else only lightly compressing the signal.

HD (1920x1080x25 H264) uses more bandwidth. The recent broadcast of They
Shall Not Grow Old (colourised WWI film) is 4.1 GB for 1h 35m. But H264 is a
more efficient means of encoding, so quality is better for an equivalent
bitrate. If HD was broadcast using MPEG2 with same degree of compression as
SD, you'd expect it to be about 1.5 * (1920 x 1080 / (720x576) or 7.5
GB/hour.


I believe the signal is left as is which means HD, e.g. 1920x1080. It
also includes sub-titles etc. Yes it's approx 8 Gb an hour. Run it thru
Any Video Converter downto 720x480 @ 29.x fps XVID and 192 Kbs MP3 and I
get a file around 700 Mb. If I want to keep it for backup that's what I
keep. The old dvd quality is good enough for these old eyes.
 




Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off






All times are GMT +1. The time now is 10:36 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 PCbanter.
The comments are property of their posters.