FFV1 bit rate higher in v13

HaloC

Hi, I first installed Voukoder v12.2 earlier this year and my goal is to archive large RED camera video files to FFV1.

We wanted to encode directly from Adobe Premiere Pro 2023.

Our source footage is 6K in REDCODE LQ format @ 23.98fps with an average data rate of 110 MB/s.

We did many tests with FFV1 with different settings and ended up with native 6K resolution, YUV 422 10bit, FFV1 v3, GOP 1.

In brief, our tests showed an average bit rate of 600Mb/s.

Later on, I updated Voukoder to v13.1 and now, the same export shows a bit rate of 1.7Gb/s, almost 3 times bigger.

There are not that much of settings to check here, apart FFV1 version, pixel format and GOP size.

I'm having hard time finding which settings can impact that much.

Any idea on what happened here?

Note that using the same source footage, encoding with another ffmpeg GUI, with the same settings, the result has the same average of 600Mb/s as our original test. The ffmpeg library is Lavf60.3.100 for Voukoder 13.1 and Lavf60.6.100 for the other GUI.

Thanks

Vouk

I updated from FFmpeg 5 to FFmpeg 6 in these version. I didn't change anything else.

I might try to make a new build with a recent version of FFmpeg and we can check the results.

Vouk

Can you try if this version fixes the issues?

Release 13.2beta1 · Vouk/voukoder

Release Notes This is a BETA version and not intended for production use! Make sure you are using the latest connector for your application(s). For using NVENC…

github.com

HaloC

I will try this today for sure. Thank you for your quick reply.

Hi, the v13.2beta1 gave the same result.

So I reinstalled v12.2 and surprise, I now get the same high bit rate.

I compared both files with MediaInfo and I don't get what's different other than bit rate.

See attached comparison.

The first test was on the full length file (2 hours) and the latest was on a 10sec.

Could it be something related to Premiere?

My first tests were with a previous version of Premiere 2023.

Vouk

I tried to reproduce this with the static smpte bars and it looks like this:

Code

Video
ID                             : 1
Format                         : FFV1
Format version                 : Version 3.4
Codec ID                       : V_MS/VFW/FOURCC / FFV1
Duration                       : 4 s 964 ms
Bit rate mode                  : Variable
Bit rate                       : 78.6 Mb/s
Width                          : 5 760 pixels
Height                         : 3 240 pixels
Display aspect ratio           : 16:9
Frame rate mode                : Constant
Frame rate                     : 23.976 (24000/1001) FPS
Color space                    : YUV
Chroma subsampling             : 4:2:2
Bit depth                      : 10 bits
Scan type                      : Progressive
Compression mode               : Lossless
Bits/(Pixel*Frame)             : 0.176
Stream size                    : 46.5 MiB (95%)
Default                        : No
Forced                         : No
coder_type                     : Range Coder
MaxSlicesCount                 : 6
ErrorDetectionType             : Per slice

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To me it looks like how good the codec is able to compress the source footage. With complex material you get a high bitrate, with very simple video you get a low bitrate.

HaloC

Yes, I think you're right, it's just about the content. Obvious, one would say, but video encoding is a complex world. Thank you for your time.

Vouk 14. Juni 2023 um 17:35