mplex error in GUI for DVDAuthor

[TheManuel]

I have everything ready to go but the authoring process will not complete because of this error. Could it be I am running the max bit rate too high in the encoder (HC)?

• (shrink and) mux video and audio files
  INFO: [???] mplex version 2.0.0 (2.2.3 $Date: 2004/01/13 20:45:26 $)
  INFO: [???] File D:\Viaje a PR - Disc 1.m2v looks like an MPEG Video stream.
  INFO: [???] File D:\Viaje a PR - Disc 1 1.ac3 looks like an AC3 Audio stream.
  INFO: [???] Video stream 0: profile 8 selected - ignoring non-standard options!
  INFO: [???] Found 1 audio streams and 1 video streams
  INFO: [???] Selecting dvdauthor DVD output profile
  INFO: [???] Multiplexing video program stream!
  INFO: [???] Scanning for header info: Video stream e0 (D:\Viaje a PR - Disc 1.m2v)
  INFO: [???] VIDEO STREAM: e0
  INFO: [???] Frame width : 720
  INFO: [???] Frame height : 480
  INFO: [???] Aspect ratio : 16:9 display
  INFO: [???] Picture rate : 29.970 frames/sec
  INFO: [???] Bit rate : 9500000 bits/sec
  INFO: [???] Vbv buffer size : 229376 bytes
  INFO: [???] CSPF : 0
  INFO: [???] Scanning for header info: AC3 Audio stream 00 (D:\Viaje a PR - Disc 1 1.ac3)
  INFO: [???] AC3 frame size = 1024
  
  INFO: [???] AC3 AUDIO STREAM:
  INFO: [???] Bit rate : 32768 bytes/sec (256 kbit/sec)
  INFO: [???] Frequency : 48000 Hz
  INFO: [???] SYSTEMS/PROGRAM stream:
  INFO: [???] rough-guess multiplexed stream data rate : 9963496
  INFO: [???] target data-rate specified : 10080000
  INFO: [???] Setting specified specified data rate: 10080000
  INFO: [???] Run-in Sectors = 89 Video delay = 13019 Audio delay = 0
  INFO: [???] New sequence commences...
  INFO: [???] Video e0: buf= 237568 frame=000000 sector=00000000
  INFO: [???] Audio bd: buf= 16384 frame=000000 sector=00000000
  ++ WARN: [???] Stream e0: data will arrive too late sent(SCR)=312385097 required(DTS)=0
  ++ WARN: [???] Video e0: buf= 172634 frame=104020 sector=01772717
  ++ WARN: [???] Audio bd: buf= 13987 frame=108464 sector=00055093
  INFO: [???] Scanned to end AU 125170
  INFO: [???] STREAM bd completed @ frame 130516.
  INFO: [???] STREAM e0 completed @ frame 125170.
  INFO: [???] Multiplex completion at SCR=375880557.
  INFO: [???] Video e0: buf= 3743 frame=125170 sector=02127410
  INFO: [???] Audio bd: buf= 8192 frame=130516 sector=00066295
  INFO: [???] VIDEO_STATISTICS: e0
  INFO: [???] Video Stream length: 5841886 bytes
  INFO: [???] Sequence headers: 6984
  INFO: [???] Sequence ends : 1
  INFO: [???] No. Pictures : 125170
  INFO: [???] No. Groups : 6984
  INFO: [???] No. I Frames : 6984 avg. size 67867 bytes
  INFO: [???] No. P Frames : 34821 avg. size 54394 bytes
  INFO: [???] No. B Frames : 83366 avg. size 23183 bytes
  INFO: [???] Average bit-rate : 8237600 bits/sec
  INFO: [???] Peak bit-rate : 9499600 bits/sec
  INFO: [???] BUFFERING min 15 Buf max 235543
  INFO: [???] AUDIO_STATISTICS: bd
  INFO: [???] Audio stream length 133649408 bytes.
  INFO: [???] Frames : 3659283367
  INFO: [???] BUFFERING min 35 Buf max 14368
  **ERROR: [???] MUX STATUS: Frame data under-runs detected!

Thanks

[ChrissyBoy]

You are within the bitrate limits (just!) but I think the warning you recieve is the issue. DTS & PTS must be after the SCR for a given packet. mplex claims you have DTS=0 when SCR=312385097 ...

[TheManuel]

OK, thanks but what does that mean in English or Spanish?
I'm afraid I am a bit of a newbie with DVDAuthor or mplex (on which there is scarcely any information on the web).
I suspect the issue could be with the m2v and ac3 files I am trying to multiplex since tried Muxman and got a similar error along this lines:
"The buffer underflowed 6 times. Resulting DVD may not play smoothly"
The .m2v file was encoded with HC and the .ac3 file with Aften (a project based on AC3Enc but with improvements).

Any suggestions?

[Rauli]

All dvd's i seen that play ac3 with two channels are encoded at 192kbits. Maybe if you can re-encode to a lower bitrate it would help? Mplex should output detailed parameter listings with mplex --help I use dvd styler which includes the dvd author package and its parameters when mplex is called upon are mplex -f 8 -S 0 -M -V -o "outputfilename.vob" "inputvideofile.m2v" "inputaudiofile.ac3/wav/mp2" I would also try to encode that video at a lower bitrate since its pushing the envelope a bit. I like to allow for an margin error of 10%, that is go 10% less of what the theoretical maximum is allowed and if you can use variable bitrate then the quality loss should be less if you are already using CBR.

Thanks,
Rauli

[TheManuel]

Well, I tried a 192kb stream just for kicks but the problem is still there. In fact, I tried to reproduce the problem using a 10sec clip from the video that is generating the errors but encoded at bitrates higher than spec and the muxing goes by smoothly.

Perhaps, the much longer original video gives more chance for errors operating at high bit rates?

It takes 14 hours to encode the whole video on my feeble computer. This is why I am trying to find an explanation before switching to trial and error on the whole video.

These are the command line options used by GFD on mplex:
-f 8 -o "d:\output.mpg" "D:\input.m2v" "D:\input.ac3"

[borax]

I can also only guess...
Maybe the bitrate is really to high, or the output from HC is not 100% compliant.
You can try to use another multiplexer (imago or bbmpeg), but I'm not sure that it works, i.e. because imago + ac3 often causes problems too.

[AlanHK]

I use HC a lot. If it's done a pulldown on 23.976 -> 29.97 fps occasionally muxers complain the GOPS are too long. But they always play perfectly.

I've had hassles with AC3, but MP2 always works. If you don't really have or need surround sound, convert it to MP2 stereo. BeSweet can do this pretty easily.

[TheManuel]

I tend to think it there is an issue with my source m2v or ac3 file since I am getting problems with two different multiplexing programs.
I will try an mp2 file tonight instead of ac3 and see what happens although my guess is the same problem will happen.
If all else fails I will have to re-encode the whole thing again at a lower peak bit-rate to try and make the problem go away.

[electorite]

i fixed it while adding nav packets in debian linux. my reply is in a different post here
https://forum.videohelp.com/threads/282317-data-will-arrive-too-late-what-am-I-doing-wr...=1#post2360866

i don't know if this will fix your problem, but i want to write it here for something to try because it will probably work because i got the same exact buffer underrrun error

[manono]

Now, if you had only been around eight years ago...