iMovie should be able to export Apple Intermediate Codec which is perhaps the best option on the Mac.  It's a highly optimized and works at any resolution. 

On Sun, Feb 3, 2013 at 3:11 PM, me.grimm <megrimm@gmail.com> wrote:
I have always used 'photo-jpeg'
Maybe try that?

For those on osx:
Unfortunately handbrake does not compress for that.
I get students to compress from FCP or iMovie on the mac. Also apparently the new FCP x requires compressor (extra 50$) to compress to pjpeg. I am also curious to know an open-souce compression solution on Mac optimized for gem playback if someone here might know. Preferably with the ease of handbrake.

m

On Feb 3, 2013, at 2:19 PM, Stephan Elliot Perez <dreamoftheshoreofanotherworld@gmail.com> wrote:

> Greetings,
>         I am just starting to use GEM and am having a problem with video playback using pix_film. The CPU goes through the roof and the video naturally lags. My original video clips were in .MTS (panasonic, 1920 x 1080) format. I then converted them into .mp4 (Codecs: H.264, AAC) using Handbrake and then into .mov (Codecs: MPEG-4 Video) using MPEGstream.
>         Are the codecs the problem or the video quality/file size the problem? What do you suggest I do?
>
> Best regards,
> Stephan
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