[FFmpeg-devel] [PATCH 2/2] movenc: add timecode track support.

Tim Nicholson nichot20 at yahoo.com
Tue Mar 20 13:27:52 CET 2012

On 20/03/12 08:00, Clément Bœsch wrote:
> On Tue, Mar 20, 2012 at 07:39:01AM +0000, Tim Nicholson wrote:
>> On 09/03/12 16:51, Clément Bœsch wrote:
>>> From: Clément Bœsch <clement.boesch at smartjog.com>
>>> The example in the QT specs shows a likely invalid gmin atom size, which
>>> suggests tmcd atom is contained in the gmin one, while it is actually in
>>> the gmhd atom, following gmin (according to the given layout on the same
>>> page, and various samples):
>>> [..]
>> ping.
> Patch rebased for review, no functional changes from previously (IIRC).

OK this sort of half works, but something isn't quite right.

Ffprobe reports the timecode OK as does FCP7 and sebsky. *However* if you scroll
along the clip the timecode gets lost/freezes. This does not happen with a
genuine clip.

Inspecting the clip in Quicktime7 using <Command> J and comparing with the same
clip exported out of FCP shows a significant difference.

Whilst the duration of my sample clip is shown as 01:01.92 for all tracks in the
exported (genuine) version. The ffmpeg version shows the timecode track as being
only 4 frames long. (By comparison ffmbc timecode track has the same duration as
the clip and scrolls OK)


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