Convert Media Question

[justinds89 3]

Hello, I was trying to use a scheduled task to convert some media from x264 to HEVC x265. It seemed to work as intended except that even though I chose to match original quality on the bitrate the new media file has a much lower bitrate and the overall file size is about 1/3rd of the original.

I know the file size should be reduced some, but that seems excessive and I would think the bitrate should stay the same correct?

Maybe I am misunderstanding something.

[PenkethBoy 2068]

I do my own h264 to h265 and yes the bitrate drops and i get roughly a 1/3rd size file

remember h265 is much more efficient than H264 and can provide the same visual with a lower bit rate

for perspective if you did a conversion the other way the file would be double the bit rate and size etc to try and maintain the quality

on your pc play both side by side - can you tell the difference - if the options emby uses are correct then you should have a hard job telling them apart

99.9% of my conversions are fine - and the 0.1% are because the original file is pants - so not a problem with the transcode - there are the occational edge case but only have 1 or 2 of those out of 15k conversions.

 

[justinds89 3]

Ah okay, I will try side by side comparison once I am able to.

For some reason I was thinking the file size would go down, but the bit rate would stay the same.

Appreciate the response!

[PenkethBoy 2068]

If they look significantly diff then something else is going on

one of the reasons i do the conversions outside emby as its in my control then

[justinds89 3]

3 minutes ago, PenkethBoy said:

If they look significantly diff then something else is going on

one of the reasons i do the conversions outside emby as its in my control then

I was thinking of doing it outside of Emby, but couldn't really find a good way to run a schedule that would convert the files between a certain time.

As long as there isn't a noticeable quality drop I think it will work really well for my purposes doing it within Emby for select media as a scheduled job.

[PenkethBoy 2068]

if on windows then a script can be run via task scheduler at a time of you choosing

or with a cron job on linux etc 

[Luke 42085]

Quote

remember h265 is much more efficient than H264 and can provide the same visual with a lower bit rate

Yes exactly.

[Carlo 4561]

2 hours ago, justinds89 said:

Ah okay, I will try side by side comparison once I am able to.

For some reason I was thinking the file size would go down, but the bit rate would stay the same.

Appreciate the response!

Bitrate is directly proportional to file size.

[PenkethBoy 2068]

yep you can calculate the file size from the bitrate of the streams - within a very small margin of error