QSF FIle size / Bit rate loss.

[Jackersen]

Why is there a difference in the file size and bit rate after quick stream fix only. I have only just started to do this part separately. I assumed that when you cut adds send to batch; run batch that this would do a quick stream fix as well as cuts.

So now that i do QSF on its own i can see the impact on file size and bit rate and wondered of an explanation?

Clip board ctrl L..

Size : 1.733 GB
Duration : 00:49:29.21
Mux type : WTV
Video: Encoding : H.264
VideoStreamID : x233
Frame rate : 25.00 fps
Encoding size : 1920 x 1080
Aspect ratio : 16:9
Header bit rate : 25.000 Mbps
VBV buffer : 572 KBytes
Profile : High/4.0
Progressive : Interlaced (MBAFF)
Chroma : 4:2:0
Entropy mode : CABAC
Bit rate : 4.238 Mbps
Audio Stream: 1 (Primary) Codec : MPEG
MPEGLayer : Layer 2
Channels : 2.0
Language : eng
PID : x232
PES Stream Id : xC0
Bit rate : 256 Kbps
Sampling rate : 48000
Sample size : 16 bits



Size : 1.268 GB
Duration : 00:49:28.07
Mux type : WTV
Video: Encoding : H.264
VideoStreamID : x206
Frame rate : 25.00 fps
Encoding size : 1920 x 1080
Aspect ratio : 16:9
Header bit rate : 25.000 Mbps
VBV buffer : 572 KBytes
Profile : High/4.0
Progressive : Interlaced (MBAFF)
Chroma : 4:2:0
Entropy mode : CABAC
Bit rate : 3.036 Mbps
Audio Stream: 1 (Primary) Codec : MPEG
MPEGLayer : Layer 2
Channels : 2.0
Language : eng
PID : x205
PES Stream Id : xC0
Bit rate : 256 Kbps
Sampling rate : 48000
Sample size : 16 bits


Cheers.

 

[Dan203]

WTV files are like TS files, they can contain garbage data, like null packets, that get removed when you remux the file. The bitrate shown in that dialog is just a calculation which essentially uses the total file size, divides by duration/frame rate, then subtracts the audio bitrate. So when the file gets smaller the video bitrate shown in that dialog also goes down. The actual video bitrate did not change. The only way to change the actual video bitrate is to recode.

 

[Jackersen]

Thank-you. Exceptionally prompt with a response as usual.