Quantcast Large flash and red lines problems? - digitalFAQ Forum
  #1  
07-12-2020, 06:19 AM
Barbeuk Barbeuk is offline
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Hello,

After reading this forum and it's numerous "How To", I gave it a try using my far from good workflow :

Daewoo VQ431S (SECAM-L, PAL-B/G; NTSC) -> Magix Video Converter 3 -> VirutalDub 2 (I have just seen that 1.9 is better apparently...)

I have followed the tutorial on how to setup VirtualDub (YUV2 encoding, etc).

Apart from the few dropped frames (2 to 3) I have a lot of inserted frames (1000+ sometimes. I guess it's not as bad as having a lot of dropped one), 2/3 of my S-VHS (21 out of 34) appears to have a lot of artifact.

I know I should buy a correct setup, but I was wondering if this kind of artifact will disappear with the appropriate hardware.

You can find attached what I call a "good" video versus the ones of bad quality. These video are x264 encoding from Huffuyuv RAW (no filter added). You can find the encoding settings at the end.

The two major problems (for me at least) is that if the "flash" artifact is present, it is on the whole video.
As for the "red lines" that you can clearly see on sample n°4, if I adjust something called "PR" on my Daewoo, I can make the lines go lower and practicaly hide them, but then the top start jiggling a lot.

Here are the images when the "flash" and "red lines" artifact appears. There are two version as I found out that they are not the same picture when I capture them using the built-in tool of Sony Vegas Pro, compared to the preview that it displays.

Took using built-in capture:

Took using screen capture of the preview:

Took using built-in capture:

Took using screen capture of the preview:

Took using built-in capture:

Took using screen capture of the preview:

Urls of the images in case preview break:
https://ibb.co/2v0K7bD
https://ibb.co/Cv8xCyx
https://ibb.co/xjVJzB5
https://ibb.co/TcjQ57S
https://ibb.co/nDNF1LD
https://ibb.co/TM4HXrk

Here are video encoding parameters used:
Code:
Général
Complete name                            : C****
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/avc1)
File size                                : 2,12 Mio
Duration                                 : 6s 0 ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 2 959 kb/s
Encoded date                             : UTC 2020-07-12 09:47:44
Tagged date                              : UTC 2020-07-12 09:47:44

Vidéo
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3
Format settings                          : CABAC / 5 Ref Frames
Format settings, CABAC                   : Oui
Format settings, Reference frames        : 5 images
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 5s 760 ms
Bit rate                                 : 3 000 kb/s
Maximum bit rate                         : 4 544 kb/s
Width                                    : 720 pixels
Height                                   : 576 pixels
Display aspect ratio                     : 5/4
Frame rate mode                          : Constant
Frame rate                               : 25,000 Im/s
Standard                                 : PAL
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressif
Bits/(Pixel*Frame)                       : 0.289
Stream size                              : 2,02 Mio (95%)
Writing library                          : x264 core 157 r2969 d4099dd
Encoding settings                        : cabac=1 / ref=5 / deblock=1:-2:-2 / analyse=0x3:0x113 / me=umh / subme=7 / psy=1 / psy_rd=1.00:0.25 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=6,6 / fast_pskip=0 / chroma_qp_offset=-4 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=0 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=70 / rc=2pass / mbtree=1 / bitrate=3000 / ratetol=1.0 / qcomp=0.80 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.10 / aq=1:0.50
Encoded date                             : UTC 2020-07-12 09:47:44
Tagged date                              : UTC 2020-07-12 09:47:44
Codec configuration box                  : avcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 6s 0 ms
Source duration                          : 6s 23 ms
Source_Duration_LastFrame                : -14 ms
Bit rate mode                            : Variable
Bit rate                                 : 127 kb/s
Maximum bit rate                         : 133 kb/s
Channel(s)                               : 2 canaux
Channel layout                           : L R
Sampling rate                            : 44,1 kHz
Frame rate                               : 43,066 Im/s (1024 SPF)
Compression mode                         : Avec perte
Stream size                              : 93,3 Kio (4%)
Source stream size                       : 93,7 Kio (4%)
Default                                  : Oui
Alternate group                          : 1
Tagged date                              : UTC 2020-07-12 09:47:44
--merged --

Well I though hotlink would not break on edit and that I could not attach more than 5 files

Here we go again.


Attached Images
File Type: jpg artifact_1_sony_vegas_pro_capture_tool.jpg (174.6 KB, 6 downloads)
File Type: jpg artifact_1_sony_vegas_pro_preview.jpg (144.9 KB, 6 downloads)
File Type: jpg artifact_2_sony_vegas_pro_capture_tool.jpg (220.1 KB, 2 downloads)
File Type: jpg artifact_2_sony_vegas_pro_preview.jpg (140.3 KB, 4 downloads)
File Type: jpg artifact_4_sony_vegas_pro_capture_tool.jpg (239.2 KB, 2 downloads)
File Type: jpg artifact_4_sony_vegas_pro_preview.jpg (132.1 KB, 5 downloads)
Attached Files
File Type: mp4 bad_quality_sample_1.mp4 (1.59 MB, 1 downloads)
File Type: mp4 bad_quality_sample_2.mp4 (2.12 MB, 1 downloads)
File Type: mp4 bad_quality_sample_3.mp4 (1.04 MB, 1 downloads)
File Type: mp4 bad_quality_sample_4.mp4 (1.82 MB, 3 downloads)
File Type: mp4 good_quality_sample.mp4 (2.49 MB, 3 downloads)
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  #2  
07-12-2020, 06:38 AM
hodgey hodgey is offline
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Are the recordings in SECAM-L?

If by PR you mean buttons at the front of the VCR, those usually adjust tracking. If you have a line of noise/distortion that moves up and down by adjusting tracking but will never fully go away that typically signifies that there was a tape path alignment issue on either the playback or recording VCR.

The blue bit is the capture card struggling to lock to the video signal. These capture dongles (presumably similar chip to the diamond VC500) output a blue frame if the card if fails to lock to a video signal which is what you're seeing. The fix here would be to utilize something to act as a TBC, I don't know what works well for SECAM, maybe there are DVD-recorders that can do a satisfactory job.
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  #3  
07-12-2020, 07:29 AM
Barbeuk Barbeuk is offline
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Quote:
Originally Posted by hodgey View Post
Are the recordings in SECAM-L?
Yes, it is the only standard that displays correctly the video.

Quote:
Originally Posted by hodgey View Post
If by PR you mean buttons at the front of the VCR, those usually adjust tracking. If you have a line of noise/distortion that moves up and down by adjusting tracking but will never fully go away that typically signifies that there was a tape path alignment issue on either the playback or recording VCR.
Exactly, that is what I meant (the buttons at the front of the VCR). Is there no way of fixing that ? (If the issue was on the recording VCR ?)
I guess it was on the recording side, as I have 13 tapes that are quite good.

Quote:
Originally Posted by hodgey View Post
The blue bit is the capture card struggling to lock to the video signal. These capture dongles (presumably similar chip to the diamond VC500) output a blue frame if the card if fails to lock to a video signal which is what you're seeing. The fix here would be to utilize something to act as a TBC, I don't know what works well for SECAM, maybe there are DVD-recorders that can do a satisfactory job.
I will try to find the answer.

Thank you for response !
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  #4  
07-20-2020, 12:12 AM
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lordsmurf lordsmurf is offline
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To expand/confirm hodgey:
- better capture card needed
- TBC needed
- do not resize interlaced video

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