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

Baptiste Coudurier baptiste.coudurier
Fri Sep 5 21:42:09 CEST 2008

vmrsss wrote:
> On 5 Sep 2008, at 00:51, Baptiste Coudurier wrote:
>>> 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.
> Question: I thought that mp4 and mov were essentially the same (where  
> mp4 is the standard, while mov is more of an apple creature). As a  
> rule of thumb, is there any situation where mov might be preferred  
> over mp4? (And by the way, shouldn't m4v be reserved for a elementary  
> video stream (no audio)?)

Well .m4v and .m4a are the main extentions for itunes files.
Now IMHO .mov is simpler, because it's not using all this mpeg-4 system
cruft (bifs tracks, etc..) and it supports a lot more codecs atm. So I
tend to prefer .mov

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

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