[FFmpeg-user] Sony XAVC transcoding

Wayne Poll WPoll at nhnz.tv
Wed Jun 19 11:29:25 CEST 2013

Thanks for your comments, Carl.

I'm not sure what the merge will achieve; I need to get 8 discrete mono tracks in the QT, ready for import into further processing and editing systems.

The footage may not always have 8 tracks; in fact it would be rare to have this many. But as the field use of the cameras generating the footage varies from shoot to shoot, the is no way to predict what any MXF will contain (in terms of used audio tracks), so we have to process all, assuming they are all important.

I will read up some more on the mege option, as I clearly missed the point of using it. :-)

Many thanks...

Wayne Poll | Technical & IT Systems Manager |
NHNZ | 5 Melville Street, Dunedin 9016, New Zealand 

Sent from my iPhone.

On 19/06/2013, at 19:50, "Carl Eugen Hoyos" <cehoyos at ag.or.at> wrote:

> Wayne Poll <WPoll <at> nhnz.tv> writes:
>> The actual problem turned out to be Quick Time, which 
>> is misreporting the actual output from ffmpeg.
> I am not so sure.
> FFmpeg does mark the second to the eighth audio stream 
> "mute" (actually non-default) because this is what most
> users need: They mix several language tracks into one 
> mov file and they are unhappy if all languages are 
> played together which is what QuickTime does if they 
> are all set to "default" (which is what you need).
> Your original report was correct afaict.
> My question is: Why is amerge not working for your use 
> case? (Note that you would have to add an option to 
> make all tracks default in any case, imo we should not 
> change the current default case. The option does not 
> exist yet, mostly because I still don't understand 
> the use case completely.)
> Carl Eugen
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