Any way to edit f4v?

Hi, I've got Premiere Pro CS4 4.1.0, and have encoded several hours worth of f4v files (h.264 and mp3) with Flash Media Live Encoder 3.0 from a live event I streamed. I've flattened them all using the f4v post processor provided by Adobe, and they all play back fine in Adobe Media Player as well as the Flash client. The problem is that I need to trim the beginning of each file, but can't import them into Premiere even though it says to "Use the F4V Post Processor tool to prepare F4V files for editing in Adobe Premiere® Pro, delivery over HTTP, or in video players that support H.264 and AAC formats, including Adobe Media Player."
I've tried importing into Premiere on two different machines. One is a dual core 2.0GHz running Vista 32-bit with 4GB of RAM, and the other is a quad core 2.6GHz running Vista 64-bit with 4GB of RAM. Both will sit and spin for an hour or more before finally throwing the unsupported file format or damaged file" error. The files are each between 400-900GB. I'm posting them as progressive downloads and don't want to waste gigs of bandwidth when the first 15-30 minutes are going to be fast-forwarded. It shouldn't be this damn hard to trim a file!!
If anyone knows of any 3rd party solutions or Adobe secrets I would be very greatful.
Thanks,
Patrick

Burzuc wrote:
"One particular limitation is that you should trim your source video only in keyframes - othervise you can sometimes expect slight lag in your video or audio out of synch."
And how do you do that? How do I know when I trim in keyframe? Because AviDemux is loosing a few seconds of sync in a 2 hr clip.
BTW, for some reason AOne Splitter will not save my f4v flatened clips "same as source", but only re-encoded, and my Adobe After Effect CS4 will crash or try to convert the file before open (it took too long importingand so I forced it to close)
Thank you,
Mike
Hi,
here is screenshot where you can see how to recognize frame type - in h.264 video there are three types of frames: I, P and B. And the I frame is only another name for keyframe, so you need to check against that type. Also you can utilize the two highlighted arrows, which will skip to prev/next keyframe.
I actually tested for those audio lags in long clips and I have experienced no issues, even in 6 hr long clip. But I have not tested HD stream yet, only PAL.
Plz write more about your hw configuration and sw versions you use.
PS: sorry for non-english captions in screenshot, i didn't figure out how to change language of interface in AviDemux

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