Sorry if translation is poor, but I'm French using a French version of Video Studio v8 (trial)
question: when I capture from Mini-Dv camcorder to Mpeg (firewire connection) I always receive a lot of message saying something like; ' emptying transcodage buffer ' during this time the capture is suspended and when it restart, this cause a 'mini cut' in the movie captured (sound and image). Who can explain me how to suppress this problem, because it is a real problem to have those cutoff during a movie of music or during a discussion...
thanks, Oh.
capture and transcodage buffer
Moderator: Ken Berry
Transcoding Buffer
What's happening is the video is going into your computer via firewire, but it is being buffered, and your computer is transcoding it to mpeg on-the-fly. The problem is when that buffer fills up, it stops capturing to "flush" the buffer (finish transcoding the dv video that's already in the buffer). When it's done flushing the buffer, it starts up again with the dv capture.
This works fine when you are dealing with a digital camcorder, because when the capture stops, the digital camcorder also pauses -- so you don't get any "gaps" in your finished video.
But this does not work when you are using an analog-to-dv converter because when the capture stops, there's no way to pause the analog video source -- so the video source keeps on playing even though the dv capture process has momentarily stopped while the flushing of the buffer occurs.
To minimize the pauses, make sure you stop all non-essential background tasks during capture (virus scanner, task scheduler, etc...). Also try capturing to a dedicated video hard drive.
btw, what are your system specs, because in the end it might just be that your computer isn't up to the task of on-the-fly mpeg encoding...
This works fine when you are dealing with a digital camcorder, because when the capture stops, the digital camcorder also pauses -- so you don't get any "gaps" in your finished video.
But this does not work when you are using an analog-to-dv converter because when the capture stops, there's no way to pause the analog video source -- so the video source keeps on playing even though the dv capture process has momentarily stopped while the flushing of the buffer occurs.
To minimize the pauses, make sure you stop all non-essential background tasks during capture (virus scanner, task scheduler, etc...). Also try capturing to a dedicated video hard drive.
btw, what are your system specs, because in the end it might just be that your computer isn't up to the task of on-the-fly mpeg encoding...
George
-
ohla
-
thecoalman
When you capture to mpeg it has to be encoded real time, this cannot be done in real time unless you have a very fast machine, 3 ghz is close but it depends on other components too. If it can't do it in real time it has to pause the tape until it catches up.
If your experiencing problems capturing to mpeg try capturing to DV. You don't have to capture to mpeg. Capturing to DV is relatively stress free on the CPU because there is no encoding involved you only need a machine fast enough to write the data to HD which is most recent computers. You are in fact transferring the footage to your computer. This DV video can be used in your project just like MPEG, VS8 will encode it to mpeg for final output to DVD since it doesn't have to be done in real time there won't be any pauses to transcode.
If your experiencing problems capturing to mpeg try capturing to DV. You don't have to capture to mpeg. Capturing to DV is relatively stress free on the CPU because there is no encoding involved you only need a machine fast enough to write the data to HD which is most recent computers. You are in fact transferring the footage to your computer. This DV video can be used in your project just like MPEG, VS8 will encode it to mpeg for final output to DVD since it doesn't have to be done in real time there won't be any pauses to transcode.
Added bonus...
to add to thecoalman's reply -- there seems to be less issues with audio/video sync when you capture to dv .avi, and then convert to mpeg in your final steps. The things to be careful about -- dv .avi needs about 13gb per hour, and if you have Fat32 drives, then you will need to break it up into 4gb chunks (filesize limitation of Fat32).
Don't get me wrong, some folks capture to mpeg all the time, and never have a problem with audio/video sync.
Don't get me wrong, some folks capture to mpeg all the time, and never have a problem with audio/video sync.
George
-
StevieB
Capturing to DV same as AVI?
George W and Coalman -- your comments are very helpful . . . followed your advice (and others on a previous post about this same buffering problem) and your suggestion to capture to DV rather than MPEG solved my problem (ie there was no pause or interruption in the capturing process) . . . one more Q: when do you capture to DV vs. capturing to AVI? I am capturing analog footage that is being fed through a Canopus converter which is connected by firewire to my computer . . . thanks
Steve
Steve
Which Canopus?
Which Canopus device? ADVC1xx, ADVC3xx, other?
If you are capturing .avi videos through the firewire connection, you are most likely capturing dv .avi's. you should be able to right-click a video in VideoStudio for its properties...
Do all your editing using dv .avi, and then save mpeg encoding as your last step before dvd authoring. The quality should be excellent at roughly 6000kbps when you encode to mpeg2 (if you plan to author for dvd).
If you are capturing .avi videos through the firewire connection, you are most likely capturing dv .avi's. you should be able to right-click a video in VideoStudio for its properties...
Do all your editing using dv .avi, and then save mpeg encoding as your last step before dvd authoring. The quality should be excellent at roughly 6000kbps when you encode to mpeg2 (if you plan to author for dvd).
George
-
owestern
Computer spec
Hello!
Can anyone recommend I computer spec so I can capture MPEG in real time. I really like to avoid the flushing buffer cause I am capture and compress MPEG with live video.
And I've tried DV, but it gets to big to handle with afterwards.
Now I am using a Centrino laptop with 1.6Ghz and 1GB RAM and a Radeon 9600 graphic card.
frengky
Can anyone recommend I computer spec so I can capture MPEG in real time. I really like to avoid the flushing buffer cause I am capture and compress MPEG with live video.
And I've tried DV, but it gets to big to handle with afterwards.
Now I am using a Centrino laptop with 1.6Ghz and 1GB RAM and a Radeon 9600 graphic card.
frengky