[FFmpeg-devel] AC3 Format Detection unreliable.
Sun Aug 5 04:14:47 CEST 2007
On Sat, Aug 04, 2007 at 08:33:03PM -0400, Justin Ruggles wrote:
> Justin Ruggles wrote:
> > Dan Sully wrote:
> >> * Dan Sully shaped the electrons to say...
> >>>> Yes, please make the stream(s) available.
> >> Also, I am on an amd64 system.
> > Doesn't look like that's an issue. I'm getting the same thing on my
> > system. The file is valid. The issue seems to be the frame size.
> > 640kbps 48kHz is the largest AC3 frame size, and I think it's not
> > fitting enough frames into the probe buffer to give a positive
> > detection. I'll look into it.
> The problem with this sample is two-fold. The first issue is that the
> probe buffer in this case is only 2048 bytes. The frame size for this
> sample (and any others which are 640kbps & 48kHz) is 2560. Therefore,
> only 1 frame is detected. I changed the threshold for a score of 50
> down to 2 frames, but this doesn't help here. After I changed to 1
> frame (at the start of the stream) it now gets a score of 50, but then a
> 2nd issue occurs.
> The sample is misdetected as MPEG-PS because it gets a score of 52 from
> mpegps_probe() for some odd reason. I don't know a whole lot about the
> MPEG-PS format, so I don't think I can figure that part out...
feel free to revert the parts of your changes to ac3_probe which made it
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Why not whip the teacher when the pupil misbehaves? -- Diogenes of Sinope
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 189 bytes
Desc: Digital signature
More information about the ffmpeg-devel