After using modify/contents some frames go out of stage dimension

Question

Hello,
I have a question to all you animators out there.
I work in after effects and sometimes do some simple illustrations/animations in flash - where I usually switch the bg colour to gray
as not to see the stage rectangular as it's distracting to me. Then when I have my drawings and a few different frames done I go to
modify/ choose bg colour to white and check contents to frame all the content inside the document - then I want to export it to swf
so I can use it in after effects.
At this point all seems fine, all the frames are in place, however I noticed that frequently when I reopen my flash documet after having done this some frames are outside
the white stage box (usually later frames, the 1st is in place).
How do you deal with this?

Answer 1

Hi all,
Sorry for the slow response - as I'm sure you can understand, running lots of exports takes a few days and so it's taken me a while to test your suggestions properly.
The render completes using the media encoder without crashing (MPEG2 Blu-ray and H.264 Blue Ray both worked), however the picture quality has really blurred:
Original:
MPEG2 Blu-Ray
I also ran it in H.264 Blur-ray and this also appeared blurry. Apologies for lack of a screenshot, I deleted the export to conserve disk space.
This is very similar to the problems I had under File => Export => Movie, which went away after I tweeked the export settings to match as closely as possible the footage (however Premiere then crashed when I tried to export the entire movie rather than just a clip).
Working settings under File => Export which crashed Premiere but prevented the blurriness:
Export
Video and audio
Entire Sequence
Filetype
QuickTime
Video Settings
Compressor: H.264
Frame size: 1280h 720v (1.000)
Frame rate: 29.97 frames/second
Pixel Aspect Ratio: Square Pixels (1.0)
Fields: No Fields (Progressive Scan)
Audio Settings
Compressor: Uncompressed
Sample rate: 48000 samples/second
Channels: Stereo
Sample type: 16-bit
Settings under Adobe Media Encoder
Any thoughts what I'm doing wrong? This is starting to get really frustrating and I'm genuinely wondering if Premiere is suitable for what I'm trying to do. I've another project a month late in getting started because I want to get Premiere to export this so I know I'm not going to run into the same problems again - but I really don't know what else to try? Any ideas?