Comments on: I (Heart) Picsearch And Python

By: Multimedia Mike

Multimedia Mike — Wed, 10 Dec 2008 00:45:36 +0000

QDMC is well known as an earlier incarnation of the widely-used QDM2 codec. It has been shown through reverse engineering to be similar but not strictly compatible with its successor. It is great that we have some more samples, the lack of which has traditionally impeded RE efforts.

By: compn

compn — Wed, 10 Dec 2008 00:07:05 +0000

binary codecs were uploaded to:
http://samples.mplayerhq.hu/drivers32/new/
please test and let me know if any other dlls are required.

By: mkhodor

mkhodor — Tue, 09 Dec 2008 08:44:49 +0000

> > QDMC – undiscovered, no documentation
>
> http://wiki.multimedia.cx/index.php?title=QDesign_Music_Codec

FFmpeg has a buggy decoder for QDM2, and nothing for QDMC. So there is no complete and accurate documentation.

By: astrange

astrange — Tue, 09 Dec 2008 06:01:21 +0000

> QDMC – undiscovered, no documentation

http://wiki.multimedia.cx/index.php?title=QDesign_Music_Codec

By: Multimedia Mike

Multimedia Mike — Tue, 09 Dec 2008 02:25:50 +0000

Thanks for your work on this, compn. I have been watching your commits to files like riff.c. I will be taking those into account as I methodically add samples to the MultimediaWiki (slow process, just take it a few at a time, each evening).

By: compn

compn — Tue, 09 Dec 2008 02:24:07 +0000

added a few of those codecs to mplayer and ffmpeg
still a few left to figure out.

i wonder if that vorbis/theora in .mov file plays on anything :)

By: Vitor

Vitor — Sat, 06 Dec 2008 17:07:54 +0000

> I took a look at the uncommon audio codecs list. The most frequent codecs are:

> 0×1100736d – What is this?

This is adpcm_ima_wav, works fine with recent SVN.

By: Multimedia Mike

Multimedia Mike — Sat, 06 Dec 2008 16:08:21 +0000

True, uncommon != unsupported in FFmpeg. And there has already been a lot of movement on the development mailing list to map some of the video FourCCs to known codecs (apparently, there are even more aliases for MPEG-4 part 2 video).

By: Anonymous

Anonymous — Sat, 06 Dec 2008 15:29:07 +0000

I took a look at the uncommon audio codecs list. The most frequent codecs are:

0x1100736d – What is this?
0x7a21 – AMR (What happened to this SOC project?)
wmav1 – should work
truespeech – should work
QDMC – undiscovered, no documentation
real_288 – should work
0×0006 – a-law, should work
pcm_s24le – should work
sawb – AMR
mace3 – should work
imc – Intel Music Coder, should work
pcm_s32be – should work
adpcm_swf – should work
0×0163 – WMA lossless, undiscovered
drms – No way
fl64 – floating point PCM, should work
0×0402 – Ligos Indeo Audio, undiscovered
mp1 – MPEG layer 1, should work
fl32 – floating point PCM, should work
Qclq – QCELP, stuff to test
adpcm_ct – Creative ADPCM decoder, should work
0x00ff – AAC, should work
pcm_s32le – should work
0x7a22 – AMR
0×0003 – floating point PCM, should work

So most of the above look like good things to test.

By: Reimar

Reimar — Sat, 06 Dec 2008 09:32:28 +0000

That’s why I always put my scripts in ~/bin. But I guess I have a few fewer than you ;-)