[mythtvnz] ffmpeg transcoding in MythTV

[Brett Miller]

My mythburn logs show a audio codec mismatch ?
The error info is confusing to the non-user.

Ffmpeg seems to recognise the h.264 AVC file/stream & identifies the 
LATM & AC3 audio.

I guess identifying the type & then doing something are two separate things.
Have never used VLC.

Have spent sometime trying (failing) to understand mpeg-4 LATM etc..
Does the LATM container contain/mux the 2ch AAC & the multi- ch AC3 ?
Can the LATM container hold any audio format ?
Is this the point of LATM ? to mux multiple alternative audio tracks ?

Can there be multiple audio & video streams muxed in the main h.264 AVC 
stream ?

If ffmpeg command line option was to use AC3 audio (TV3) could it be 
able to transcode ?
I guess the answer lies in the answer to the LATM question above.

I noticed that a 'dev' on mplayer was suggesting dumping use of libfaad 
(LATM patch) because (he stated) ffmpeg does LATM now.
There were many corrections posted...

With Norway, Denmark & parts of UK using LATM with DVB service this 
support might come a bit sooner.

Thanks.


On 26/03/2010 10:29 a.m., Jonathan Hoskin wrote:
>
>     > Transcoding FreeviewHD from MythTV.
>     >
>     > Should the ffmpeg in Ubuntu9.04 be able to transcode h.264 AVC  into
>     > mpeg-2 ?
>
>
> [Insert rant about slow FFMpeg release cycles here]
>
>     If you only want to transcode to mpeg2 then I think the MythTV
>     transcode
>     utility should do the job for you.
>
>
> Nope. Mythtranscode doesn't support H.264 (not with autodetect at 
> least). Eg:
>
> $ mythtranscode -e dvd -i recordings/2002_20100326081400.mpg -o 
> tmp/test.mpg
> 2010-03-26 10:22:21.410 Using runtime prefix = /usr
> ...
> 2010-03-26 10:22:22.215 Transcode: Looking for autodetect profile: 
> Autodetect from 720p
> 2010-03-26 10:22:22.233 Transcode: Couldn't find profile for : H.264
> 2010-03-26 10:22:22.233 Transcoding aborted, no profile found.
> Have you tried clvc (CLI based VLC) to get what you want? That's what 
> I use for transcoding H.264 to other formats.
>
> Jonathan
>
>
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