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MPEG2 Exporting for exhibition
Hello – I’m sure this has been answered before, however I cant find a good description or any good advice and I have a bid hand in of all my final work tomorrow – so no more time to browse!
I have my final films – all good – exported as H.264 from Premiere Pro CS5.5, however for the big degree show exhibition that goes along with this hand in I have a screen I’m displaying my work on. – Its a cheap Toahiba 32 inch with a 1920/1080 resolution.
I’m using a USB to play back the films. The TV however will only take MPEG2 – Something I’ve never had to use before. I have one export – and its not terrible, but there is some annoying loss of quality.
It has to be a .mpg file and it has to have a MAX bit rate of 20mbit/s.
Any thoughts on the best compression for this? And weather the TV could actually take more than 20mbit/s ?Thanks,
Need to do my last exports tonight.Theo
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2 Replies
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It would be helpful if more information was provided regarding the loss of quality. Is the primary issue banding/blocking? Luma/chroma shifts? Loss of detail in bright and dark areas? Jagged lines? Other?
Banding/blocking: maximize Intra DC Precision in the Advanced MPEG-2 options, and increase the Minimum Bitrate setting.
Color shifts: avoid RGB intermediate formats. You could apply offsets to the sequence with the RGB Color Corrector, but it is probably not worth the effort at this point.
Lack of bright/dark details: view the footage in the YC and RGB Parade scopes to ensure values are in the 0-100 IRE range. This will be noticeable in the sequence; it is not a byproduct of rendering.
Jagged lines: enable Use Maximum Render Quality.
Refer to the hardware specs and/or run a few test files in advance to verify the configurations supported by the Toshiba display. The conservative option is to use one of the MPEG-2 presets and change bitrate to 20mbps.
1920×1080 at 20mbps should/might be OK. Consider rendering another copy at 1440×1080 (widescreen 1.333) and/or 1280×720 (square pixels 1.000) and let the display scale it up during playback.
Use VBR 2-pass encoding.
GOP structure of M=3 and N equals 0.5 or 1.0 seconds (converted to frames) is typical for MPEG-2. Longer GOP lengths are OK, but you don’t gain much past one second. Closed GOP (equal to N) and automatic GOP placement are preferred.
You might not have enough time, but MPEG2 can be “tuned.” Filesize can be reduced sometimes through an iterative process of increasing and decreasing the bitrate targets to find the point where the data is compressed most efficiently.
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You need to go up higher with the data rate for mpeg2 to start looking good.
Chris
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