[FFmpeg-devel] [PATCH] get the right value for the dac3 atom

[Baptiste Coudurier]

vmrsss wrote:
> Hi
> 
> On 4 Sep 2008, at 19:43, Baptiste Coudurier wrote:
>>> The are different ways of muxing ac-3 in mov, all valid. The dac3  
>>> atom
>>> inside mov has been used only by apple in QuickTime 7.5 when they
>>> introduced an ac3 importer.
>> It's standardized by ETSI now, so there is only one way to mux ac-3 in
>> mp4. .mov is another story of course, but the official way will always
>> be apple's one. I could not generate .mov containing ac-3 yet, samples
>> welcome.
> 
> Well, my experience is that with current ffmpeg, x264 + ac3 works well  
> in QT 7.5 if the extension is .mov and does not ("An invalid sample  
> description was found in the movie") if the extension is mp4 (all the  
> rest being equal). (for information, mplayer can't find the audio  
> stream in any of the files, while ffplay plays them just fine.)  
> Perhaps I can help with testing.

Nice to hear, I confirmed this too.
Quicktime player recognizes the ac-3 track (Displaying "AC3" in
informations) when placed in .mov and .m4v, however it chokes on .mp4
too, QT is known to be picky about .mp4.

Thanks for testing.

-- 
Baptiste COUDURIER                              GnuPG Key Id: 0x5C1ABAAA
Smartjog USA Inc.                                http://www.smartjog.com
Key fingerprint                 8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA