BandicamFanNumber1
Posts: 10
Joined: Tue May 12, 2015 9:25 pm

AMD VCE Codec doesn't seem to record at 50fps as expected

Tue Jun 18, 2019 9:22 pm

Hello,

I'm trying to screen-record a tennis match at 50fps with AMD VCE codec but it clearly appears that it's not recording at 50fps but at something like 20fps. I have no proof because Bandicam doesn't allow us to see the fps while recording non-DirectX/OpenGL videos but I'm sure of myself.

My PC ...
¨¨¨¨¨¨¨

OS : Windows 7 Pro SP1
Graphic Card : AMD RADEON RX580
Processor : i7-3770 @3.4Ghz
RAM : 32GB

BANDICAM CONFIG ...
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨

Bandicam version : 4.4.1.1539 (fully registered)
Bandicam mode : Screen Recording Mode
File Type : MP4
Video Size : Full Size
FPS : 50 CFR
Codec : H264 (AMD VCE), CBR, 150 Keyframes, H264 FourCC
Bitrate : 10,000 Kbs
Audio : AAC/192Kbs/Stereo/48Khz

SOURCE VIDEO ...
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨

It's the live stream of Eurosportplayer.com
Not sure what the fps is but it's really smooth so it's at least 25 or 30fps.
The quality is 720p but I record it in full screen so it's stretched to 1920x1080.


RECORDED VIDEO ...
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨

General
Complete name : J:\bandicam 2019-06-16 18-53-20-678.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (mp41)
File size : 11.3 GiB
Duration : 2 h 39 min
Overall bit rate mode : Variable
Overall bit rate : 10.2 Mb/s
Encoded date : UTC 2019-06-16 16:53:20
Tagged date : UTC 2019-06-16 16:53:20
Writing application : Bandicam 4.4.1.1539 / GDI / AMD VCE

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.1
Format settings, CABAC : Yes
Format settings, RefFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2 h 39 min
Bit rate : 9 977 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 50.000 FPS
Standard : Component
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.096
Stream size : 11.1 GiB (98%)
Language : English
Encoded date : UTC 2019-06-16 16:53:20
Tagged date : UTC 2019-06-16 16:53:20
Color range : Limited

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 2 h 39 min
Duration_LastFrame : -1 ms
Bit rate mode : Variable
Bit rate : 192 kb/s
Maximum bit rate : 330 kb/s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 223 MiB (2%)
Language : English
Encoded date : UTC 2019-06-16 16:53:20
Tagged date : UTC 2019-06-16 16:53:20

I've uploaded part of the result video file here : https://we.tl/t-I9kVUkUBni (I cut it lossless with Ultra Video Splitter). The MediaInfo says that it's 50fps but it's not the case. I can see with my eyes that it's something like 20fps because it's not very smooth, I can clearly see the difference with the source stream.

Thanks for your help !

Cédric, a registered user.

PS : I know that the original video source is not 50 fps but around 30 fps, but I'd like to understand why recording at 50fps gives a choppy video.

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Bandicam Company
Site Admin
Posts: 6313
Joined: Mon Dec 20, 2010 12:19 pm

Re: AMD VCE Codec doesn't seem to record at 50fps as expected

Thu Jun 20, 2019 12:26 pm

Hello BandicamFanNumber1,

We have found that the recorded video looks choppy.
It might happen when you record the target video with higher resolution and fps settings.
Unfortunately, we are quite unsure about the specs such as the resolution and fps of the source video since it is not available in our country.
However, there might be a possibility that the source file has lower resolution and fps than recording settings.
Do you have the same issue with the H264(CPU) codec?
We look forward to your reply.

Thank you.

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