Doom9's Forum - View Single Post - ffdshow tryouts project: Discussion & Development

madshi · 7th November 2007, 22:19

FWIW, I've managed to decode an E-AC3 sample with ffmpeg and it works ok, but there are 2 problems:

(1) Decoding seems to be always 16bit? Not sure, at least that's what I got without changing any options. But maybe it's possible to force 24bit decoding somewhere somehow. I'm a beginner with using libavcodec.

(2) The ffmpeg decoded E-AC3 file plays slightly distorted. The same E-AC3 sample file is not distorted when decoding with Nero's E-AC3 decoder.

So as far as I can see, ffmpeg's E-AC3 decoding support is not ready to go yet. I also tried getting the TrueHD/MLP decoder to work, but failed. It did extract one audio frame sometimes but then stopped working.

I think we need to have some patience. And I think ffdshow doesn't need to hurry with adding E-AC3 and TrueHD/MLP support. The decoders first need to become stable.

7th November 2007, 22:19	#2385 \| Link
madshi Registered Developer Join Date: Sep 2006 Posts: 9,140	FWIW, I've managed to decode an E-AC3 sample with ffmpeg and it works ok, but there are 2 problems: (1) Decoding seems to be always 16bit? Not sure, at least that's what I got without changing any options. But maybe it's possible to force 24bit decoding somewhere somehow. I'm a beginner with using libavcodec. (2) The ffmpeg decoded E-AC3 file plays slightly distorted. The same E-AC3 sample file is not distorted when decoding with Nero's E-AC3 decoder. So as far as I can see, ffmpeg's E-AC3 decoding support is not ready to go yet. I also tried getting the TrueHD/MLP decoder to work, but failed. It did extract one audio frame sometimes but then stopped working. I think we need to have some patience. And I think ffdshow doesn't need to hurry with adding E-AC3 and TrueHD/MLP support. The decoders first need to become stable.