what are "overflows"?

[sgbd]

I use the mpeg2 encoder QuEnc to convert my avi files to mpeg2, but some files during the conversion has some "overflow", I wondered why this happens?

MediaInfo of this file:

Format : AVI
Format/Info : Audio Video Interleave
File size : 644 MiB
Duration : 1h 21mn
Overall bit rate : 1 107 Kbps
Writing application : VirtualDubMod 1.5.10.2 (build 2540/release)
Writing library : VirtualDubMod build 2540/release

Video
ID : 0
Format : MPEG-4 Visual
Format profile : Advanced Simple@L5
Format settings, BVOP : Yes
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Muxing mode : Packed bitstream
Codec ID : XVID
Codec ID/Hint : XviD
Duration : 1h 21mn
Bit rate : 1 102 Kbps
Width : 688 pixels
Height : 368 pixels
Display aspect ratio : 1.870
Frame rate : 23.976 fps
Resolution : 8 bits
Colorimetry : 4:2:0
Scan type : Progressive
Bits/(Pixel*Frame) : 0.182
Stream size : 641 MiB (100%)
Writing library : XviD 1.2.1 (UTC 2008-12-04)

My Quenc Command Line:

-i "C:\filmes\avisynth_script.avs" -o "C:\filmes\Encoded_video.m2v" -b 7533 -maxbitrate 9000 -mpeg2mux svcd -maxbframes 2 -vbr -dc 10 -gopsize 18 -priority 5 -hq -notrell -2 -aspectratio 4:3 -auto -close

I was wondering what causes overflows, could someone tell me?

maybe it could be because of the "muxing mode" or bitrate, but i'm not sure.

Edit: I forgot to say, just happens to pass 2.

thx

[redwudz]

Buffer overflows probably. They are when the program tries to use more memory than the buffer is set up for and writes to another memory location. Usually causes a crash. This article from Wikipedia may explain it a bit better: http://en.wikipedia.org/wiki/Buffer_overflow

[sgbd]

Buffer overflows probably. They are when the program tries to use more memory than the buffer is set up for and writes to another memory location. Usually causes a crash. This article from Wikipedia may explain it a bit better: http://en.wikipedia.org/wiki/Buffer_overflow

but it just happens to some videos, i don't understand it.

[jman98]

Why are you using the svcd profile argument on mpeg2mux? What you are creating is not valid for SVCD.

[sgbd]

Why are you using the svcd profile argument on mpeg2mux? What you are creating is not valid for SVCD.

What value should I put?

[Bonie81]

I guess Quenc with your setting -maxbitrate 9000 surges the bit-rate spontaneous spikes higher than 9800 kbps which may lead to buffer-over flow. Try to lower -maxbitrate setting little-bit to 8800 or 8600 and see if it is still over-flows. Buffer overflow may also leads to memory leaks causes undesired output.

[sgbd]

I guess Quenc with your setting -maxbitrate 9000 surges the bit-rate spontaneous spikes higher than 9800 kbps which may lead to buffer-over flow. Try to lower -maxbitrate setting little-bit to 8800 or 8600 and see if it is still over-flows. Buffer overflow may also leads to memory leaks causes undesired output.

thx, I tried but still having "overflows" ;/

[jman98]

Why are you using the svcd profile argument on mpeg2mux? What you are creating is not valid for SVCD.

What value should I put?

DVD.

Look at our link "What is VCD" to see a table that tells what SVCD contains. What you are creating is not even close to being SVCD.

[sgbd]

If I authoring a DVD with this file with overflows, I'll have problems to watch on my DVD?