Audio playing back slower than it should be?

[ants]

I grabbed the Build 2 bundle today, and decided to give it a go with the DVD-single for Bjork's "All is Full of Love" video (nice and short, good for testing). The video looks great, but the audio is playing back too slow (the lower pitch and tempo are actually quite noticeable), and therefore gets further and further out of sync as the video plays...

I checked the MP2 that BeSweet spat out, and that seems to be where the problem is -- it's actually encoded at a slower speed, somehow. This didn't happen with the Build 1 bundle I was using last week...

Any idea what I've done wrong? I tried at both 192 and 224kbps, with the same results. I keep the audio downsampling on because I'd like my encodes to be SVCD-spec...

[DSPguru]

probably the bug of ssrc & negative delay combination.
download BeSweet v1.11 from my homepage.

[ants]

Yeah, the audio delay was -67 or something.

Grabbed the new BeSweet, ripping now, I'll let you know how it goes. Thanks!

[ants]

Well, v1.11 fixed it. Thakns for the speedy help!

[DSPguru]

thank you for finding a bug :)

[DDogg]

I wanted to mention to all that many people forget this critical last step of saying, "It is fixed now".

When you do so, it allows the coders to "close" a bug in their list clearly and cleanly. Thx, ants!

[Zoltan]

Hello, I have been struggling with a similar problem for a week now with the latest codes so this is the time to escalate now since all I could find in the forums is related to audio synch problems, which is not the case here.

Symptom: I am encoding this (http://www.amazon.com/exec/obidos/ASIN/B00004XOR4/qid=1013767041/sr=2-2/ref=sr_2_2/002-4491545-4571210) DVD. Widescreen anamorphic, and I decode the AC3 stream. I would like to have PAL SVCDs. Two bin files are prepared, quality is excellent, the video and audio are in synch, but regardless the player the whole film is cca 20% slower than it should be (running 1:58:31 instead of 1:38:40). I tried WinDVD, PowerDVD and Philips 751 with the same results. The ripped vobs in WinDVD file mode sound OK. Ripping was done using DVDDecrypter and internal routines, both of them gave the same. I tried with or without audio downsampling and different audio bitrates. None of them helped.

Software used: Windows XP Pro, dvd2svcd 1.0.6 build 4 with BeSweet 1.2.b1 (primarily used) or 1.11 (just for test, same result).

Here is Encoded_audio_1.log:

BeSweet v1.2b1 logfile.
--------------------------
Logging start : 02/14/02 , 15:41:08.

C:\Program Files\DVD2SVCD\BeSweet\BeSweet.exe -core( -input E:\dvd2svcd\Extracted_audio_1.ac3 -output E:\dvd2svcd\Encoded_audio_1.mp2 -logfile E:\dvd2svcd\Encoded_audio_1.log ) -azid( -L -3db -c normal ) -ota( -g max -d -33 -r 1200 1001 ) -ssrc( --rate 44100 ) -2lame( -e -b 224 -m s )

[00:00:00:000] +------- BeSweet -----
[00:00:00:000] | Input : E:\dvd2svcd\Extracted_audio_1.ac3
[00:00:00:000] | Output: E:\dvd2svcd\Encoded_audio_1.mp2
[00:00:00:000] | Floating-Point Process: No
[00:00:00:-33] | Overall Track Gain: 9.5dB
[00:00:00:-33] +-------- AZID -------
[00:00:00:-33] | Output Stereo mode: Dolby surround compatible
[00:00:00:-33] | Total Gain: 0.0dB, Compression: Normal
[00:00:00:-33] | LFE levels: To LR -3.0dB, To LFE 0.0dB
[00:00:00:-33] | Center mix level: BSI
[00:00:00:-33] | Surround mix level: BSI
[00:00:00:-33] | Dialog normalization: No
[00:00:00:-33] | Rear channels filtering: No
[00:00:00:-33] +-------- SSRC -------
[00:00:00:-33] | Source Sample-Rate: 48.0KHz
[00:00:00:-33] | Dest. Sample-Rate: 44.1KHz
[00:00:00:-33] | Attenuation : 0.0db
[00:00:00:-33] +-------- FRC --------
[00:00:00:-33] | Source Frame-Rate: 1001
[00:00:00:-33] | Dest. Frame-Rate: 1200
[00:00:00:-33] +-------- 2LAME ------
[00:00:00:-33] | Bitrate method : CBR
[00:00:00:-33] | MP2 bitrate : 224
[00:00:00:-33] | Channels Mode : Stereo
[00:00:00:-33] | Error Protection: Yes
[00:00:00:-33] +---------------------
[01:38:51:999] Conversion Completed !
Logging ends : 02/14/02 , 16:27:12.

I am encoding video at the moment but the dvd2svcd_log.txt created so far is as follows. It's a notebook so it is running at only 0.5, pls forgive him :)

--------------------------------------------------------
- 2002.02.14. 14:43:25
- DVD to SVCD Conversion
- DVD2SVCD ver. 1.0.6 build 4
--------------------------------------------------------
Initializing
Initializing finished.

--------------------------------------------------------
- 2002.02.14. 14:43:30
- Free on drive E: 13389.06 mb
- Internal rip
--------------------------------------------------------
Preparing vobfiles to be ripped:
- F:\VIDEO_TS\VTS_02_1.vob
- F:\VIDEO_TS\VTS_02_2.vob
- F:\VIDEO_TS\VTS_02_3.vob
- F:\VIDEO_TS\VTS_02_4.vob
- F:\VIDEO_TS\VTS_02_5.vob
- F:\VIDEO_TS\VTS_02_6.vob

Ripping: F:\VIDEO_TS\VTS_02_1.vob
Ripping: F:\VIDEO_TS\VTS_02_2.vob
Ripping: F:\VIDEO_TS\VTS_02_3.vob
Ripping: F:\VIDEO_TS\VTS_02_4.vob
Ripping: F:\VIDEO_TS\VTS_02_5.vob
Ripping: F:\VIDEO_TS\VTS_02_6.vob
Ripping finished. Speed: 2611

--------------------------------------------------------
- 2002.02.14. 15:21:45
- DVD2AVI
--------------------------------------------------------
Creating DVD2AVI INI file:
- C:\Program Files\DVD2SVCD\DVD2AVI\DVD2AVI.INI

Variable settings:
iDCT_Algorithm: 32-bit SSE MMX

Executing DVD2AVI.
Executing DVD2AVI. Commandline:
"C:\Program Files\DVD2SVCD\DVD2AVI\DVD2AVI.exe" -IA=1 -CS=2 -YR=1 -EXIT -OF=[E:\dvd2svcd\DVD2AVI_Project_file] -IF=[E:\dvd2svcd\VTS_02_1.vob,E:\dvd2svcd\VTS_02_2.vob,E:\dvd2svcd\VTS_02_3.vob,E:\dvd2svcd\VTS_02_4.vob,E:\dvd2svcd\VTS_02_5.vob,E:\dvd2svcd\VTS_02_6.vob]
Analyzing DVD2AVI Project file
Force Film NOT activated!
Framerate: 29970
DVD2AVI processing done.

--------------------------------------------------------
- 2002.02.14. 15:29:17
- Free on drive E: 7539.79 mb
- AUDIO Extraction
--------------------------------------------------------
Found AC3 stream id: 0x80
Filename: E:\dvd2svcd\Extracted_audio_1.ac3
Audio1 delay: -33 ms
Audio extraction finished.

--------------------------------------------------------
- 2002.02.14. 15:41:03
- Free on drive E: 7222.98 mb
- AUDIO conversion
--------------------------------------------------------

Converting Audio to MP2. Filename: E:\dvd2svcd\Extracted_audio_1.ac3
Executing BeSweet. Commandline:
"C:\Program Files\DVD2SVCD\BeSweet\BeSweet.exe" -core( -input "E:\dvd2svcd\Extracted_audio_1.ac3" -output "E:\dvd2svcd\Encoded_audio_1.mp2" -logfile "E:\dvd2svcd\Encoded_audio_1.log" ) -azid( -L -3db -c normal ) -ota( -g max -d -33 -r 1200 1001 ) -ssrc( --rate 44100 ) -2lame( -e -b 224 -m s )
Audio conversion of E:\dvd2svcd\Extracted_audio_1.ac3 finished.

Audio conversion finished.

--------------------------------------------------------
- 2002.02.14. 16:27:14
- Free on drive E: 7033.09 mb
- Converting Pictures
--------------------------------------------------------
Converting: E:\dvd2svcd\dhm.jpg
Converting: C:\Program Files\DVD2SVCD\DefaultChangeCD.bmp
Finished converting pictures
--------------------------------------------------------
- 2002.02.14. 16:27:24
- Free on drive E: 7031.83 mb
- Video Encoding
--------------------------------------------------------

Executing Cinema Craft Encoder.
StreamSectors: 1663691176
AudioSectors: 201692988
VideoPAPO: 22647132
ScanOffsetBytes: 266669
SeqAligningBytes: 16948265
VideoEndHeader: 8
SubtitleSectors: 0
EmptySectors: 238.00
PictureSectors: 900.00
PureMPEGStream: 1422136114.83
Seconds: 7107.16
CDSize: 800.00
Cut point 795.00
Variable Settings:
Frames: 177779
Anti Noise Filter: 2
Passes: 4
Image Quality: 17
VAF file creation: On
Video Encoding Mode: Multipass VBR
Min. bitrate: 1850
Max. bitrate: 2350
Avg. Bitrate: 1600

I do hope the above info is enough to get some idea on what's going on here.

Thanks in advance,
Z

[Zoltan]

Checking the logs I posted today I found this part in Encoded_audio_1.log:

[00:00:00:-33] | Source Frame-Rate: 1001
[00:00:00:-33] | Dest. Frame-Rate: 1200

Hmmm. My playback is exactly 20% slower than the normal. Anyone knows the meaning of these values? Downsampling (48/44.1 = 1.088..)would cause a 8,8% difference...

Thanks,
Z

[da franksta]

perhaps you should try enabling FORCEfilm?

nice concert, btw:)

[Zoltan]

In my understanding Force Film Automatic mode, which I'm using now, sets Force Film to On if dvd2svcd thinks it's needed. I suppose it analyzes the video framerate for this.

- Am I wrong?
- May there be cases when dvd2svcd cannot determinate the framerate well?
- Could someone explain what Force Film exactly does? I searched read though the Q&A, the FAQ and search both forums and found no details. Can it really make the output video+audio 20% slower to play?

Anyhow, I started a new run with Force Film = On. Will report.

Thanks,
Z

[Zoltan]

da franksta, this is to say a big thank you! Problem solved, all is perfect now.

Nevertheless, I suggest a new item to the Q&A ('cos I could not find there):
Q: What if dvd2svcd makes an error free cd but the film is played cca 20% slower that normal?
A: If the DVD is NTSC widescreen then simply set "Force Film" to "On" at the DVD2AVI tab.

Thanks again,
Z

[DDogg]

Gee, Zoltan,

Proper information
Great follow up
and a Q&A to speak to your problem for the next guy.

I guess we have to give the weekly Awesome award to you this week. Thanks for setting a great example of how this is done! :)