"without losing any quality" is inherently impossible. Why are you trying to convert from h164 to h265?
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Replying to @11rcombs
Got it. To save HD space, primarily. I undertstand it's better to export from FCPX directly into h265 to avoid this compression problem?
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Replying to @Dogen
for exported files, yeah; try to avoid lossy->lossy transcodes when possible
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your savings from H.265 aren't gonna be night-and-day, though; expect maybe 20%-range with current encoders
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Replying to @11rcombs
Compressor seems to indicate a file size about half, any thoughts on this? You think there would be additional noticeable artifacts?
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Replying to @Dogen
if HEVC is saving you 50% then either your H264 encoder sucks or your quality is ending up worse (assuming it's not just misestimating)
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These days, the answer to storage issues is almost always to buy more storage. Multi-terabyte storage is so cheap there's just no reason to muck around with transcoding and irreversibly losing quality when you can just throw more disks at the problem.
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