Constant Frame Rate but Variable Bit Rate - Supported?

jhyler

New member
I have been looking for an acceptable way to convert VFR videos into a format that VideoReDo will support. (Yes, I know Handbrake can do it. But I have a such wide variety of dimensions, audio tracks, subtitles, etc., that finding a one-size-fits-all solution in Handbrake has proved beyond my poor abilities, and researching on the net almost makes me think nobody else has ever been in this situation. Anyway, I digress. ) I think I've found something that may do it. But according to Mediainfo, while my files now have CFR they also have VBR:

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings : CABAC / 3 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 3 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 3 min 0 s
Bit rate mode : Variable
Bit rate : 11.6 Mb/s
Maximum bit rate : 16.0 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 (29970/1000) FPS
Original frame rate : 29.970 (30000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.186
Stream size : 248 MiB (98%)
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 3 min 0 s
Duration_LastFrame : -1 ms
Bit rate mode : Constant
Bit rate : 192 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 4.12 MiB (2%)
Default : Yes
Alternate group : 1

Text
ID : 3
Format : Timed Text
Muxing mode : sbtl
Codec ID : tx3g
Duration : 3 min 0 s
Bit rate mode : Variable
Bit rate : 63 b/s
Stream size : 1.39 KiB (0%)
Language : English
Default : Yes
Forced : No
Alternate group : 3

I have been able to QSF and edit videos like these without any apparent complaint. But before I get too far into this I wanted to make sure from you guys that files like this are indeed supported. Thanks!
 

jmc

Well-known member
I would expect VBR to be no problem. VBR is listed in the "Advanced" profile options.
I always choose VBR as an option if I see it. Not CBR.

VFRate is something they are looking at. (I would not hold breath :) )
 

Danr

Administrator
Staff member
VBR is fine, most of the files we edit are VBR.

FYI, VFR development is progressing nicely. The biggest issue remaining is what to do with the thumbnail strip as that heavily relies on CFR. The current logic assumes that the distance between each frame is the same, but with VFR that is not the case.
 

jhyler

New member
Thanks for the info - it's appreciated.

Just FYI, while I would greatly appreciate VFR support from VideoRedo, the total extent of the VFR support I need is to convert away from it as soon as possible. If you had a QSF-like tool that converted to CFR (while leaving everything else untouched) - or, better, if you just built it into QSF itself - I would be more than satisfied. That's just me, of course, but I bet I'm not alone.
 

hydra3333

Member
Thanks for the info - it's appreciated.

Just FYI, while I would greatly appreciate VFR support from VideoRedo, the total extent of the VFR support I need is to convert away from it as soon as possible. If you had a QSF-like tool that converted to CFR (while leaving everything else untouched) - or, better, if you just built it into QSF itself - I would be more than satisfied. That's just me, of course, but I bet I'm not alone.
+1
 

Danr

Administrator
Staff member
Thanks for the info - it's appreciated.

Just FYI, while I would greatly appreciate VFR support from VideoRedo, the total extent of the VFR support I need is to convert away from it as soon as possible. If you had a QSF-like tool that converted to CFR (while leaving everything else untouched) - or, better, if you just built it into QSF itself - I would be more than satisfied. That's just me, of course, but I bet I'm not alone.
Our intention is to provide full VFR editing since it's not always possible to know if a video if CFR or VFR until you are well into the editing process.
 

Danr

Administrator
Staff member
Thanks for the info - it's appreciated.

Just FYI, while I would greatly appreciate VFR support from VideoRedo, the total extent of the VFR support I need is to convert away from it as soon as possible. If you had a QSF-like tool that converted to CFR (while leaving everything else untouched) - or, better, if you just built it into QSF itself - I would be more than satisfied. That's just me, of course, but I bet I'm not alone.
If you have one or two VFR samples, please upload them (send email to support afterwards) so we can use them for testing.
 

jhyler

New member
Sample uploaded, email sent.

I would expect that cell phone video looms large in people's minds when thinking about VFR support. I'll offer two words which I also recommend to your consideration: PlayOn Cloud.
 
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