VCD/SVCD same bitrate = same filesize ??

[Dancryer]

I recently downloaded *****See the forum rules on warez*****, and after extracting the audio in VirtualDub i opened it up in TMPGEnc as this movie is quite long i wasnt to sure what to convert it to ie: VCD or SVCD upon testing different bitrate's......it seems to be telling me that if i set the svcd bitrate at 1176 for a 71mins piece of film....it says the filesize will be 729mb which is just enough to fit on a cdr......now i thought if i use vcd instead i will be able to get a higher Bitrate ie: lower rez=lower filesize, but it seems to give me the same bitrate & filesize for the same length of film ??????

am i just being stupid or is there something im missing ??

[Craig Tucker]

Bitrate x time = filesize. Nothing else comes into the equation.

So if you have a bitrate of 1150kbps and you encode for 1 second you will have 1150kb of data, irrespective of the format you are encoding to.

[Dancryer]

your missing my point.....i think?

svcd / MPEG-2 480x576 25fps / 44100hz/ bitrate 1178/71 mins =730mb

vcd / MPEG-1 352x288 25fps / 44100hz/ bitrate 1178/71 mins =730mb

That is what TMPGEnc is telling me ??? how can that be right ??? should'nt it be a lower file size due to the lower resolution

[Piccoro]

exactly wut he said above...
what ever res or format you pick, there will only be 1178 kb of data for 1 sec.
And thats why with CBR, if you know the length you can choose kb/sec and end up w/that file size you wanted.
i want 730mb video file...71mins long so...730mb/71min=1178kb/sec
changing res or format only changes how the bytes are used, basicly.

[Craig Tucker]

your missing my point.....i think?

svcd / MPEG-2 480x576 25fps / 44100hz/ bitrate 1178/71 mins =730mb

vcd / MPEG-1 352x288 25fps / 44100hz/ bitrate 1178/71 mins =730mb

That is what TMPGEnc is telling me ??? how can that be right ??? should'nt it be a lower file size due to the lower resolution

No I'm not missing the point, the resolution is irrelevant. Like I said bitrate x time = filesize.

Now with a higher resolution you will need a greater bitrate to maintain a good picture quality. So for the examples you gave above encoded at those bitrates the SVCD resolution will actually look worse and blocky because there is not enough bitrate for that high a resolution. The higher the resolution you use the greater the bitrate you need otherwise the picture quality will actually look worse.