[FFmpeg-devel] [PATCH 1/2] lavf/avienc: Add support for palette side data packets

[Reimar Döffinger]

On 28.02.2016, at 03:10, Mats Peterson <matsp888-at-yahoo.com at ffmpeg.org> wrote:

> On 02/28/2016 03:00 AM, Mats Peterson wrote:
>> 
>> 
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> Why is the packet data in AVI packets sometimes zero bytes when using stream copy, Michael? There certainly must be some reason for it?

AVI is fixed frame rate. If you have for example variable frame rate input empty packets will be used to get the right timing.
I'm not sure that is truly the cause in your case, but it is at least one possible reason.