Enabling Hardware Decoder allows H.265 HVEC - but kills H.264 AVC

Jeff-Maruschek wrote on 12/7/2021, 8:06 PM

Vegas Pro 18 (527)

Video files are coming from a Fuji X-T4.

Video Card: Radeon 6700XT 12GB RAM

CPU: AMD Ryzen 7 3700X 8 core 3.6Ghz

System RAM: 32GB

You have three container/codec options on the Fuji...I'm trying the following two:

MOV/H.265 (HEVC)

MP4/H.264

Situation:

With Hardware Decoder set to off...the HEVC preview/playback is choppy and CPU is around 10%...but the H.264 plays perfectly and CPU is around 40%. (even up to 400 mpbs)

When I choose AMD UVD/VCN for hardware decoder...the HEVC H.265 plays in preview PERFECT...10% CPU....and about 5-8% GPU. HOWEVER...Vegas Pro won't even play back the same H.264 files. (black screen...audio plays...no video at all)

I don't care about H.265 but have some footage I need to use for the next project...I've learned my lesson and will stick to H.264 for now...however...the above doesn't make sense to me. How is Vegas not decoding an H.264 on the 6700XT at all?

I'm hoping there is a setting somewhere I'm missing. Thanks in advance.

(I tried to include all the needed into...but I'll post more if requested.)

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Comments

RogerS wrote on 12/10/2021, 9:14 PM

I also get no decoding activity and poor performance with my Intel HD 630.

Former user wrote on 12/10/2021, 9:36 PM

@RogerS do you get decode with media players and if so does it look something like this

It's very unusual for 24fps 4K AVC. This is letting the video loop 5 times, peak at beginning

RogerS wrote on 12/10/2021, 9:58 PM

With MPC Black I get this after many loops:

It has some dropped frames.

Former user wrote on 12/10/2021, 10:59 PM

It scrubs and edits nicely as would be expected from all Intra AVC with decode on or off (for me) but on a 50fps project the decoder is running 100% capacity when I conform the xt3 and xt4 files to 50fps, with dropped frames.

On a media player 4K 48fps(2x speed) XT3/4 uses more decoder then 8K AV1 60fps.