converting MPEG2 bitrate

[jodesy2]

how do i reduce the video bitrate of a svcd MPEG file from 2530 kbps to 2400 kbps

VCDeasy gives a warning that many players do not play SVCDs greater than 2400 kbps well when i drag and drop it

this is apparantly what the svcd i have is encoded at and it (the picture) lags in my toshiba dvd player, i am using the SVCD header hack and it plays, however the video lags and i believe this may be the problem

any suggestions would be appreciated

[yoda313]

Hello,

You can reconvert it with tmpgenc. Input the svcd .mpg and then select svcd as the output and select your bitrate at 2400.

Kevin

[jodesy2]

TMPGEnc says "cannot open file or is unsupported"

however it can do a simple de-multiplex of the file

why cant TMPGEnc open the file?

[yoda313]

Hello,

Well there are probably a ton of reasons why it wouldn't open the file. If you can do the demultiplex that would probably be ok. Just strip the .m2v and .mp2 files. Load them into tmpgenc. Use svcd mode for output but set the bitrate to 2400 and it should make you a new .mpg.

Kevin

[mats.hogberg]

TMPGEnc can't load mp2 (SVCD). There's a plugin, or you can install PowerDVD, and TMPGEnc can use its mp2 decoder.

/Mats

[bugster]

TMPGEnc can't load mp2 (SVCD). There's a plugin, or you can install PowerDVD, and TMPGEnc can use its mp2 decoder.

/Mats

Or there is what I find to be the most reliable way of feed mpeg-2 to TmpGenc, and that is to frameserve from dvd2avi.

[winifreid]

Isn't that what TMPGEncPlus is for? Using the above methods, will you be able to then save (encode) the mpeg2 file?

[svcdmaker]

If you use the tools to de-multiplex the file (Tmpgenc works fine), you can open the elementary streams in IFOedit to "author" a dvd. Then you can use dvd shrink to shrink the file. DVD shrink does not care if the content is SVCD to compress it. Read the user guides for the fine details on how to use the programs.

[mats.hogberg]

That might work, but seems like an awfully roundabout way to do it! So, after creating a DVD and shrinking it, you then convert it back to a SVCD mpg - Creative, to say the least!

/Mats

[svcdmaker]

The final step does not require a conversion of the video back to svcd. Just rename the vob file to mpg and you are ready to author.

[Garibaldi]

how do i reduce the video bitrate of a svcd MPEG file from 2530 kbps to 2400 kbps

If you don't want to rerender the video with TMPGENC, you can use DVD Patcher. It will change your bitrate for you without rendering! Its fast and easy!

[Faithful Follower]

@jodesy2

If the total bitrate : Video + Audio < 2770 kbs.

Any players that supports SVCD will be able to play the file.

If the total bitrate is over 2770 kbs, instead of re-encode the video, just down sample the audio to 224 kb or less, its easier, faster, and preserves the quality of the video.

[Faithful Follower]

@jodesy2

TMPGEnc says "cannot open file or is unsupported"

however it can do a simple de-multiplex of the file

why cant TMPGEnc open the file?

Although VBR audio is within SVCD spec, TMPGEnc does not like VBR audios.
The file just might be that. OR the audio is in AC3 format?

[mats.hogberg]

I quote myself:

TMPGEnc can't load mp2 (SVCD). There's a plugin, or you can install PowerDVD, and TMPGEnc can use its mp2 decoder.

/Mats

/Mats

[mats.hogberg]

@jodesy2

If the total bitrate : Video + Audio < 2770 kbs.

Any players that supports SVCD will be able to play the file.

Unfortunately not completely true. Many players that claim SVCD compatibility fail / have trouble playing mpegs above 2000-2200 kbps.

/Mats

[bugster]

how do i reduce the video bitrate of a svcd MPEG file from 2530 kbps to 2400 kbps

If you don't want to rerender the video with TMPGENC, you can use DVD Patcher. It will change your bitrate for you without rendering! Its fast and easy!

DVD Patcher will not actually change the bitrate of the data within the file. It will only change the header info that players read to determine if the file is valid. This may work for some players, but others will choke trying to read data at a bitrate that is to high for them to handle.

[marsmayhem]

You need to transcode the file to another bitrate. I know there's one around here somewhere called Restreamer (or something like that?)...

TMPGENC *outputs* MPEG2. If u want it to *read* MPEG2 files, you need to feed it via frameserving. TMPGENC Plus doesn't read MPEG2 either.

[daamon]

how do i reduce the video bitrate of a svcd MPEG file from 2530 kbps to 2400 kbps

I've read the whole thread - in short, you need to re-encode. Either the video or audio, or both. If you can do just the audio to get to or below your desired 2400kbps (whilst having a decent audio bitrate) then all well and good.

If not you'll need to transcode the video too. ReJig will do this.

[mats.hogberg]

in short, you need to re-encode. Either the video or audio, or both.

If not you'll need to transcode the video too. ReJig will do this.

Transcoding !=re-encoding. Why not take the plunge, and reencode, this time setting the bit rate right from the start?

/Mats

[daamon]

Transcoding !=re-encoding. Why not take the plunge, and reencode, this time setting the bit rate right from the start?

/Mats

Yeah, you're right - and I knew that too. Just lazy with my terminology - my bad... Sorry for any confusion jodesy2.

To clarify:

Transcoding - Take a format (in your case MPEG) and adjusting the format of the content without changing the source. An example would be lowering the bitrate while the length and the footage stayed the same, and producing a new file leaving the source untouched.

Encode - Changing one format (i.e DV AVI) into another (say MPEG2) following rules as defined by a codec. So, re-encoding would be doing that work over again - i.e. back to square one. Usually to try different settings, in your case a lower bitrate...

See the "Glossary" (top left) for full definitions as I've only picked the wording that's applicable to you...