FFmpegX :: Stalled video?

[Flip Flop Frog]

I found this kind of odd.

For starters, this is the first time FFmpegX has ever given me any results in sync. I'm not sure what you changed major, but that thanks!

But on the other hand, at about 55 or 60% of the way through the final output the video stops, and the audio just keeps playing. So when the DVD is split/authored into two MPG files, about 5 minutes into the second MPG file, the video stops/freezes and the audio keeps playing as if the video hadn't.

I checked both the two chunk MPGs and the whole MPG file as well. Both freeze at the exact same point.


The specs you might need:

Used the SVCD (NTSC) preset
DVD > SVCD (NTSC) 29.976fps
Dual Threaded
Profile Standard SVCD
Bitrate 2250
Author, Split (2), Keep Streams, Mux as SVCD

That's everything.


I tried this on two different DVDs and the do the same thing.


If someone could let me know what's up, what needs to be done, and how I can sort this out it'd be very much appreciated.



Flip.

[major]

It's probably the 4GB Quicktime bug. When it occurs, your last resort is to encode again with the "mplayer decode" option activated (slower).

Or alternatively, use "QT decode" but extract two VOBs with half of the chapters each, and encode them separately (good solution when the encoded movie has to be burned into two CDs).

[Flip Flop Frog]

So.... you mean quicktime is saying at about 4GB of the video, PISSOFF!?

Would make sense... It's about a 6GB VOB, and the problem is at about 4GB... Grrr....

Figures.... I'll give mplayer decode a try... it may be slower, but it requires less work on my part.

:P


Thanks major.....


PS: How much slower are we looking at? (Currently takes about 5 or 6 hours to do a whole 105 minutes with QT decode)

G4 Dual 1GHz, 512 DDR

[Flip Flop Frog]

Okay.... poopie...

I used the exact same settings, only I selected mplayer decode rather then quicktime decode, and my results are horrible!

The movie is sooo off sync. The video runs faster than it should.... and the everything is back to the way it used to be...



I noticed that for some reason mplayer said something about inverse tricline in the encoding, "converting to 23.976fps" which would probably be the reason why the video runs faster and the audio is way off...






Major? got any suggestions?

[major]

which result do you get if you select NTSC FILM as framerate?

[Flip Flop Frog]

which result do you get if you select NTSC FILM as framerate?

Nothing short of perfection.... I love you man!

[cathy]

which result do you get if you select NTSC FILM as framerate?

FWIW, I'm using ffmpegX: .m using the same parameters on a vob file of 6.1GB (from platoon) and I still get the stalled video at about what would be the 4GB point using either the QT or mplayer codec.

OTOH, I'm doing much better with vobs of < 4GB- got my first perfect SVCD rip using the preset.

Thanks again, major!

[major]

FYI, you could extract in two smaller VOBs by selecting only half of the chapters, and encode each one separately (good plan to fit in 2 CDs).

[cathy]

FYI, you could extract in two smaller VOBs by selecting only half of the chapters, and encode each one separately (good plan to fit in 2 CDs).

I'll try that next. It's times like this that I really wish I had a DP Mac tower and my G4 imac seems slow

[cathy]

FYI, you could extract in two smaller VOBs by selecting only half of the chapters, and encode each one separately (good plan to fit in 2 CDs).

I'm doing that lately on some stubborn movies that won't sync- the current one has 3 vob files of each ± 1 GB each- and the first segement is fine, but the ensuing one is off sync. My question is, when using audio gain, must we estimate the audio lag and adjust the gain based on that estimation?

[major]

The audio gain is a volume control, it has nothing to do with sync. How you did obtain those VOBs? Have you tried with 0SEx? Also try playing them in Quicktime player to see if audio is in sync before encoding.

[cathy]

The audio gain is a volume control, it has nothing to do with sync.

That would explain my lack of success fiddling with it

How you did obtain those VOBs?

These VOBs primarily come from non commercial DVD movies that I rip into SVCD so that they can be played on our non- DVD capable Macs. I use either DVDBackup or OSEx to extract and decrypt them. For movies that are < 4GB in the raw format, I usually use OSEx and rip the whole movie in one shot. I have about a 30% success rate using either the mplayer decode option or QT option. I re- tried one stubborn movie switching from QT to mplayer and it was successful, but that was one instance out of about 5 successful rips out of a total of 15 different movies I have attempted to rip. For larger movies, I'll rip one VOB at a time. So far I haven't had success selecting a smaller group of chapters with OSEx- it regularly crashes OSEx when I try.

Have you tried with 0SEx? Also try playing them in Quicktime player to see if audio is in sync before encoding.

Well, the VOBs are fine because I can play the TS VIDEO file from DVD Player. What I usually do is use the SVCD preset, enter the duration and select "Calculate Best" for a rate that usually lands at a Bitrate of 1996 and that can be divided into 2 CDs. Lately, my successful rips have been accomplished using the mplayer decode option on VOBs < or ± 4GB.

However, the one I'm trying now is particularly vexing. It is a movie (12Monkeys) that has 4 VOBs, each about 1 GB. I'd tried it twice before. The first time i got the video freeze (using the QT decode), and the second time I got the audio sync (using mplayer decode.) IBoth using the presets stated above. This time, I tried ripping one VOB at a time- each about 1/5 of the movie. The first one gave me a an mpeg that was pristine in quality and completely in audio sync- I thought I had the problem licked, but the second and 3rd VOB that I tried the same trick with, has the audio lag where it is about .5 seconds too late. That's what makes it frustrating- getting my hopes up when the first one works great, then being let down and not knowing how to correct it on seemingly a similar file. After the ripping the subsequent VOBs, the video and audio quality is perfect and the file size is roughly the same as the first good one, just the audio sync problem.

Anyway, I have had some successes and I really appreciate the work you've put in on this app.

[major]

Lately, my successful rips have been accomplished using the mplayer decode option on VOBs < or ± 4GB.

"mplayer decode" has no 4GB limitation, and it can accept as input a VIDEO_TS folder (that's better than selecting a VOB file), then you can simply select the start-end chapter to encode in the video tab (not because of the 4GB limit, but in order to cleanly split in N CDs).

the audio lag where it is about .5 seconds too late.

If the lag is constant throughout the movie, you can try to remux the .m2v and .mp2 files with the "Mux as" tool, and selecting the "Sync" field (mpeg2enc options) with a 500 delay (value in msec).

[cathy]

Thanks- I can't wait to try these out- I'll report back here.

[cathy]

the audio lag where it is about .5 seconds too late.

If the lag is constant throughout the movie, you can try to remux the .m2v and .mp2 files with the "Mux as" tool, and selecting the "Sync" field (mpeg2enc options) with a 500 delay (value in msec).

Okay- that fixed the out of sync segment right up. Next I'll try the VIDEO_TS folder suggestion.

Thanks again!