Comparing H.265 (HEVC) and H265 video file size

#1

Post by janandonly » Thu, Mar 25, 2021, 12:25 AM UTC

Comparing H.265 (HEVC) and H265 video file size
janstechtalk.blogspot.com

Re: Comparing H.265 (HEVC) and H265 video file size

#2

Post by miles » Thu, Mar 25, 2021, 1:28 AM UTC

> Some more Ducking made me aware that using '-tag:v hvc1' in FFmpeg creates files that QuickTime can eat.

Can you please share the full ffmpeg syntax used for converting the H.264 files to H.265?

Re: Comparing H.265 (HEVC) and H265 video file size

#3

Post by mrtnmcc » Thu, Mar 25, 2021, 1:30 AM UTC

This is compressing video recordings of a computer desktop. The frames don't change much so this isn't surprising.

Re: Comparing H.265 (HEVC) and H265 video file size

#4

Post by [deleted] » Thu, Mar 25, 2021, 1:31 AM UTC

[deleted]

Re: Comparing H.265 (HEVC) and H265 video file size

#5

Post by eikenberry » Thu, Mar 25, 2021, 1:34 AM UTC

The main hurdle for adoption, aside from onerous patents, is waiting for hardware acceleration to be common place. What is the current state of h.265 hardware accel? Does it come with everything yet like h.264 does?

Re: Comparing H.265 (HEVC) and H265 video file size

#6

Post by jonnycomputer » Thu, Mar 25, 2021, 1:35 AM UTC

miles wrote: post #2

> Some more Ducking made me aware that using '-tag:v hvc1' in FFmpeg creates files that QuickTime can eat. Can you please share the full ffmpeg syntax used for converting the H.264 files to H.265?

I recently did this, and used this to guide me: https://unix.stackexchange.com/a/38380/86174

Re: Comparing H.265 (HEVC) and H265 video file size

#7

Post by LeoPanthera » Thu, Mar 25, 2021, 1:39 AM UTC

miles wrote: post #2

> Some more Ducking made me aware that using '-tag:v hvc1' in FFmpeg creates files that QuickTime can eat. Can you please share the full ffmpeg syntax used for converting the H.264 files to H.265?

If your videos are already h.264, you probably should not convert them to h.265. You'll lose some quality to generation loss and the difference in size is not huge.

Re: Comparing H.265 (HEVC) and H265 video file size

#8

Post by boomboomsubban » Thu, Mar 25, 2021, 1:41 AM UTC

mrtnmcc wrote: post #3

This is compressing video recordings of a computer desktop. The frames don't change much so this isn't surprising.

Can you clarify this please? Does h.265 have some better deduplication compression or does reencoding apply something that the original recording could not, meaning h.264 would have the same benefit.

Re: Comparing H.265 (HEVC) and H265 video file size

#9

Post by BelenusMordred » Thu, Mar 25, 2021, 1:42 AM UTC

jonnycomputer wrote: post #6

miles wrote: post #2

> Some more Ducking made me aware that using '-tag:v hvc1' in FFmpeg creates files that QuickTime can eat. Can you please share the full ffmpeg syntax used for converting the H.264 files to H.265?

I recently did this, and used this to guide me: https://unix.stackexchange.com/a/38380/86174

If you can spare the time I'd also add a slower type preset in there for better compression. eg.

    -preset slower

    # You control the tradeoff between video encoding speed and compression 
    # efficiency with the -preset options. 
    # ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow. 
    # Default is medium.

Re: Comparing H.265 (HEVC) and H265 video file size

#10

Post by PostThisTooFast » Thu, Mar 25, 2021, 1:42 AM UTC

In general, that claim is bogus. H.265 may have some additional optimizations for areas of pure color and static content like a computer screen, but no way will you get that level of compression and quality with photographic motion-picture content.

Also... I've never seen Mac screen-capture functions record audio. What Mac OS built-in screen recorder also captures audio?

Instead of memorizing undiscoverable hotkey combinations, I just keep the Screenshot app in the dock.