[FFmpeg-devel] TrueHD decoder bug or something else is wrong

Ramiro Polla ramiro.polla
Sun Jul 19 18:44:37 CEST 2009


On Sun, Jul 19, 2009 at 12:52 PM, Konstantin
Dimitrov<kosio.dimitrov at gmail.com> wrote:
> i have 3 very small TrueHD samples and the raw PCM (stereo, 16bit,
> 48kHz) sources from which they are created (taken from Blu-ray disc),
> you can find them here:
> http://rapidshare.com/files/257596582/thd_samples.tar.bz2.html (size: 144Kb)

Please don't use rapidshare. Follow http://ffmpeg.org/bugreports.html
and upload the files to our FTP.

> and the files are as follows:
> sample0[1-3]_stereo_16bit_48khz.thd : the TrueHD sample
> sample0[1-3]_stereo_16bit_48khz.pcm : raw PCM source - both Left and
> Right channel
> sample0[1-3]_stereo_16bit_48khz_left.pcm : raw PCM source - Left channel only
> sample0[1-3]_stereo_16bit_48khz_right.pcm : raw PCM source - Right channel only
> for example when i use FFmpeg version SVN-r19371 with
> sample02_stereo_16bit_48khz.thd i get:
> [truehd @ 0xf92870]Lossless check failed - expected 92, calculated bf.
> and as a result Left channel is decoded byte-by-byte identical with
> the source, but there are some different bytes in the Right channel
> compared to the source.
> the problem with other two samples is similar, but with them both
> channels are decoded not byte-by-byte identical with the source and
> there are several different bytes.
> so, as the subject says, does some bug in the TrueHD decoder cause the
> problem or something else is wrong like corrupted TrueHD stream?

What program did you use to create the TrueHD stream?
What does an official TrueHD decoder produce?

Ramiro Polla

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