[FFmpeg-user] AVCHD to QT and Avid

[Thomas Worth]

On Fri, Sep 28, 2012 at 3:24 AM, bouke <bouke at editb.nl> wrote:
> ---- Original Message -----
> From: "Carl Eugen Hoyos" <cehoyos at ag.or.at>
> To: <ffmpeg-user at ffmpeg.org>
> Sent: Friday, September 28, 2012 11:04 AM
> Subject: Re: [FFmpeg-user] AVCHD to QT and Avid
>
>
>> bouke <bouke <at> editb.nl> writes:
>>
>>> FFmbc version 0.7-rc7
>>
>> I'd normally write "Wrong mailing list?", but since
>> you seem to be easily offended:
>
> Carl,
> :-)
> Yes and no. I have a problem with authority.
> (But i do admit i was too harsh, Mea Culpa.)
>
> I've tested with FFmpeg, but the result was a file that starts with a couple
> of frames white,
> and has repeated frames every now and then in QT player. Besides Avid
> refuses to AMA to it.
> Input file here if you like it: http://wtrns.fr/grXVo5ikaUWgk

The file you linked is compressed H.264 with B frames. I've never had
luck with ffmpeg / FFmbc when rewrapping H.264 with B frames to MOV.
Did you try MP4 with FFmbc? That's the only way I've gotten it to work
without the playback problems you mention. ffmpeg still won't work
even with MP4. You'll still get the white frames because of what seems
to be a bug in the MOV muxer.

Carl, as a technical note the reason he is getting the white frames at
the head with ffmpeg output is because of a bug in movenc.c. The the
elst atom is being written with incorrect values because it is
confused by the negative DTS delay with B frame media. Baptiste fixed
this in FFmbc. The fix involves modifying the start_time value based
on I believe first_dts and then adding packet.duration to it. I don't
have the source in front of me, but if you compare the source of
ffmbc.c and ffmpeg.c you'll see what I'm talking about.