[FFmpeg-devel] [PATCH] get the right value for the dac3 atom
Baptiste Coudurier
baptiste.coudurier
Fri Sep 5 01:51:11 CEST 2008
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
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