MPEG-2 video files help

[yavor76]

Hello,
I have a question about MPEG-2 records using GBPVR and hope anyone can help.It is about compression of MPEG-2 files to AVI using VirtualDub, Gordian Knot and Xvid as encoder. The problem is that bitrate what I expect never match after compression finish. For example : I give a 1400 as a bitrate in Xvid but the result is 600 or much lower than I expect I saw a difference between *.mpg made by GBPVR and Power Cinema (I had no chance to buy ATI (Sapphire) Theatrix 550 PRO PCI TV Tuner with lame software included) Gspot gave me the following information:



1. Recorded with GBPVR: [ATTACHMENT NOT FOUND]





2. Recorded with PC : [ATTACHMENT NOT FOUND]


In container window I can see that sys stream is 50885 kb/s vbr ... is this the problem when i want to edit and compress the file. I made many AVI encodings but this is my first problem with the final product size and unexpected low bitrate. Someone can help about that ?
[ATTACHMENT NOT FOUND]

[JonnyCam]

From looking at those 2 pics, it seems that your encoder (and g-spot) does nto like the VBR mpeg2 file.

If you look at the right hand side, they both show qual = 0.77 and kbps = 8000.

Maybe try setting up a new capture profile as CBR (they are stored in the config under capture sources, then edit the recording source) and then try again.

To be honest though - I have never had any trouble using Auto-Gordion Knot to encode my VBR mpeg2 files from GBPVR to Xvid.

Thanks

[yavor76]

Yes they dont like recorded file...but may be have a reason for that.
I set recording to CBR, but again the same. This *.mpg is not ordinary, there is something unusual. Below is detailed information about the file :

[COLOR="DeepSkyBlue"]MPEG-2 Validator v1.4.0.131 - 14.6.2006 г. 12:49:35

File under analysis: "D:\Records\Manual Recordings\Kanal 1_20060613220530.mpg"..!

Begin Process:

Begin Program Streams Summary:
File "D:\Records\Manual Recordings\Kanal 1_20060613220530.mpg" is a MPEG-2 Program Stream
MPEG file size 31.77 MB
MPEG Packs = 16264
Sectors delay = 0.0 ms
System headers = 1
Rate Bound = 50885200 bps -> 49692 Kbps
Video Bound = 1 active video streams
Audio Bound = 1 active audio streams
Variable Bitrate Operation (System MPEG-2 VBR)
Video Picture Rate is locked to SCR
Audio Sampling Rate is locked to SCR
MPEG Pack Size = 2048
Packets per Pack = 1
Program Mux Rate = 49692 Kbps
Total PES packets = 16266
PES Packet Lenght Max. = 2028
Number of Video Streams: 1
Number of Audio Streams: 1
Padding Stream, packets = 6, Total = 9 KB
MPEG Audio stream, ID: C0
PES packets = 965,
Total = 1.87 MB
Video stream, ID: E0
PES packets = 15295,
Total = 29.51 MB
End Program Streams Summary.


Begin Video Streams Summary:
*Sequence_end_code NOT FOUND, in Stream E0!!
Video Delay Stream E0 = 75.3 ms
Number of Frames = 1014 -> 40.56 Sec
Number of Sequence Headers = 68
Sequence Headers Aligned = No
Horizontal Size = 720
Vertical Size = 576
Aspect Ratio = 4:3
Frame Rate = 25 fps
P-STD Buffer Size Bound = 224 KB (From System Header)
VBV Buffer Size = 112 -> (224 KB)
Stream Type = MPEG-2 MP@ML VBR
Chroma Format = 4:2:0
Picture Structure = Frame
Intra DC Precision = 10
Top Field First = Yes
DCT Type = Field
Quant. Scale = Linear
Scan Type = Alternate
Frame Type = Interlaced
Number of GOPs = 68
First GOP Closed = Yes
Number of Closed GOP = 1
Max. frames per GOP (without first & last) = 15
Min. frames per GOP (without first & last) = 15
Avg. frames per GOP (Total) = 14.91
Max. Frame Size = 71180
Min. Frame Size = 15812
Average Frame Size = 30498
Frames I = 68 -> 6%
Avg. Frame I Size = 444 KB
Frames I Total Size = 3335068 bytes, size 10%
Frames P = 271 -> 26%
Avg. Frame P Size = 111 KB
Frames P Total Size = 13120988 bytes, size 42%
Frames B = 676 -> 66%
Avg. Frame B Size = 44 KB
Frames B Total Size = 14469248 bytes, size 46%
Nominal bitrate (Sequence Header) = 12000000 bps -> 11718 Kbps
Average Bitrate = 5956 Kbps
Peak Bitrate (1 sec) = 6133 Kbps
End Video Streams Summary.


Begin Audio Streams Summary:
Elementary Stream C0 is a MPEG Audio Stream
Audio Delay Stream C0 = 85.3 ms
Audio decoded bytes = 7778304 -> 40.51 Sec
P-STD Buffer Size Bound = 4 KB (From System Header)
Found 0 sync words
Audio Sync Losses: 0
Layer = 2
bitrate = 384 Kbps
Frequency = 48000 Hz
Error protection = Disabled
Private flag = 0
Mode = stereo
Copyright flag = 0
Original flag = 0
Emphasis = none
Left Channel DC Level = -100.0 dBFS
Right Channel DC Level = -100.0 dBFS
Left Channel Peak Level = -2.3 dBFS
Right Channel Peak Level = -2.3 dBFS
*Left Channel RMS Level = -13.3 dB
*Right Channel RMS Level = -13.3 dB
Difference Left-Right RMS Level = 0.0 dB
End Audio Streams Summary.

Video Stream Duration: 40.56 sec -> 40:14 (secs:frames)

Duration Difference from Video to Audio = 48 msec
Initial Delay Audio to Video (PTS based) = 10 msec

Processing time: 00:00:04

Result:
Compliance Test: Fail!!

End.[/COLOR]

I am so bored with this ATI Theatre.... next time I will buy something else ...10 months waiting for driver update to solve a serious problem and now with the new driver problems again. ATI Circus 550 :mad:

[yavor76]

I found that Divx work good with my recorded files and fulfill assign bitrate. May be I must use Divx despite I like Xvid more. The problem isn't in GBPVR, becouse Power Cinema recorded files give me the same problem with Xvid and this is related with the quality of the channel which I record - poor quality channels give me large deviation from the bitrate and final avi size.
Thank you for help, may be this is encoding problem - not recording.I will ask for this in some video edit forum.
...and GBPVR is simple the best software thank you!