[MPlayer-dev-eng] [BUG][PATCH] Decoding of WMV3 files fail, shows only black screen

[Alexander Strasser]

Shachar Raindel wrote:
> On 7/2/05, Alexander Strasser <eclipse7 at gmx.net> wrote:
> > Shachar Raindel wrote:
> > > On 7/2/05, Alexander Strasser <eclipse7 at gmx.net> wrote:
> >   Sorry, that I annoyed you by `defending' your position.
> 
> Sorry for being bit impolite - I worked on it till 3 AM last night,
> and when in the morning I found only the reply about "wmv is
> pre-alpha" from someone who seemed not to understand what he is
> talking about, I was quite angry. I shouldn't reply to your post
> (which was indeed supporting my case) but his. Conclusion: never post
> replies before eating brakefast :)

no problem. you will never know what will happen without a breakfast.

[...]
> The current patch will fix the things and make them work for most
> codecs (since most of the DMO codecs silently ignore the
> DMO_INPUT_DATA_BUFFERF_SYNCPOINT flag if the data fed in is not a
> key-frame, probably causing only small CPU overhead. On the other
> hand, when this flag is not set and we feed the codec with data,
> starting from the beginning of the file, it will not look for a
> keyframe, and therefore will not show anything on screen until it will
> get both the keyframe flag from MPlayer, and a keyframe in the stream
> (which is rather rare). Note that I am only guessing how the codec
> behaves, but I can tell that with this patch, all the wmv files I have
> are playing correctly, and without it I get only a black screen and a
> bunch of error messages.

  OK, i see. But I am sure it will need some investigation.
The problem is usually most trivial looking changes, can break lots
of things even when fixing others, so it's normally a good thing to
be not too hasty and test things thoroughly.

> >   BTW could you upload a stream or a portion of a stream triggering this
> > problem?
> > 
> Uploading now - buggyDMOdecoding.wmv and the attached description
> buggyDMOdecoding.wmv.txt

perfect, i'll try to look into it later tonight.

  Alex (beastd)