Ivan Myles
Forum Replies Created
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What software are you using? Please post a screen capture of your export settings.
Recommendations on presets and settings require more information on the intended use for the encoded file, any known delivery requirements, and the encoding software.
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What are the export settings? You probably need to increase the Level. Select at least L3.2 for a 1280×720-50p sequence. Please refer to H.264 Levels for more information.
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What export settings did you use? Files sizes of 750MB and 1.5GB correlate to total bitrates of 1.2 and 2.4 Mbps, respectively. For reference, YouTube compresses 1280×720 to about 1.6 Mbps, and Vimeo to about 2.5 Mbps. Therefore, the 2.4 Mbps target is feasible, but 1.2 Mbps is probably pushing the limits unless you further decrease resolution to 854×480. Here are my recommendations:
– For better compression use High/Main Profile; for better compatibility and smoother playback use Baseline Profile
– 2-Pass VBR for better compression; 1-Pass for compatibility with older mobile devices
– Level 3.1
– 750MB file: 854×480 video @ 1024kbps, audio @ 128kbps
– 1.5GB file: 1280×720 video @ 2200kbps, audio @ 160/192kbps
– Key Frame Distance set to Auto
– Adobe Media Encoder: use the H.264 format rather than the QuickTime H.264 codec; set Maximum bitrate to 1.5x average bitrate; under the Multiplexer tab set Stream Compatibility to Standard for better compression, or iPod for use on older mobile devices
– Compressor: enable Streaming for online viewing; average bitrate might need to be reduced slightly to meet the file size requirement -
Great recommendations. To build on the previous comments, perhaps one or two shots of “timeless” scenes like countryside, forest, local geological features, a creek, time lapse of the sun and clouds over an open field. Another option would be items that fit within the period even if the footage was taken at a different time/location: footpath, horse trail, horses, wagon wheel, stone fences/masonry, water well, windmill, etc.
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[Jeff Rouric] “What SHOULD I be doing”
The general theme of the previous posts is to render and compress in two stages: export to an image sequence or other high bitrate intermediate format, and then transcode the exported file(s) to H.264.
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Thank you for replying, Dustin. If I understand correctly, you are exporting the new frames into the same folder as the previously rendered image sequence, deleting the bad frames, and then changing the file names of the new frames to fit the correct point in the sequence. I will give that a try.
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You are welcome. Good luck with the presentation.
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[Dustin Lawhorn] “Another advantage to going out to image sequences is that when you get a bad frame you only lose the bad frame.”
What is the best method to replace the bad frames? I have tried re-rendering individual DPX frames and placing them into the image sequence folder with the correct frame numbers, but the new frames are not recognized (they appear black). The only method that works for me is creating a new comp/timeline with the old and new DPX files, and then encoding another image sequence. It’s faster then re-rendering all the effects in the original composition, but there’s still a bit of work (and temporary storage space) required. Is there a better way to replace frames in an image sequence?
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Some mobile devices require m4v to play the video. In the AME export settings under the Multiplexer tab set stream compatibility to iPod. This will use the H.264 m4v codec. The Standard setting uses H.264 mp42. You can find more info here: Understanding Premiere Pro’s H.264 Export Encoding Settings