[Ffmpeg-devel] WMA encoding and Windows Media Player for Mac OS X

[Michael Niedermayer]

Hi

On Sun, Mar 04, 2007 at 11:19:43PM -0600, Tyler Loch wrote:
> >ive fixed a few more random bugs in our asf muxer, could you retry?
> 
> Seems to be the same. Pops and buzzes throughout the audio track.
> I did some tweaking a couple days ago, and found that the extra_size2  
> variable was the trigger for the audio playback working:
> 
>         case CODEC_TYPE_AUDIO:
>             wav_extra_size = 0;
>             extra_size = 18 + wav_extra_size;
> --->      extra_size2 = 8;
>             break;
>         default:
> 
> Before r7960, extra_size2 was effectively set to zero. With it set to  
> 8 (or anything but zero), audio plays in WMP Mac (albeit glicthy).
> ...not terribly sure if the problem is related to a mismatch in  
> sizing, or something else.
> 
> I'm heading to bed right now...but would it be useful if I provide  
> a .wav file of the pops and buzzes tomorrow along with the original  
> audio, and/or any other data?

one thing you could try is to replace the following code in asf-enc.c
            if(enc->codec_id == CODEC_ID_ADPCM_G726 || !enc->block_align){
                put_le16(pb, 0x0190);
                put_le16(pb, 0x0190);
            }else{
                put_le16(pb, enc->block_align);
                put_le16(pb, enc->block_align);
            }
by

put_le16(pb, enc->block_align);
put_le16(pb, 1);

or

put_le16(pb, 1);
put_le16(pb, enc->block_align);

or

put_le16(pb, 1);
put_le16(pb, 1);

or maybe even 0 instead of 1

and report back if any of this makes any difference or even fixes the problem
completely

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Dictatorship naturally arises out of democracy, and the most aggravated
form of tyranny and slavery out of the most extreme liberty. -- Plato
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