PSNRf graph is empty

[Lawrence58]

Hello. I work almost exclusively with Quicktime v210 files that are copies from various videotape formats. I rely heavily on the PSNRf filter graph for quality assessment. Many files, especially those from Betacam SP tapes, do not display a graph in the PSNRf filter graph. The only thing displayed is a vertical line at various points on the timeline. Sometimes there is only one. Other times 3 or 4. When I zoom in and position the cursor on a line I can see that one or more of the PSNRf Y, U, or V channels indicate a value of INF. That seems to be what prevents the waveform from being displayed.

Is there a way to display a waveform under these circumstances. I have tried with my limited knowledge to edit the bar chart conditions but to no avail.

QCTools v1 and v2.

[dericed]

Hi @Lawrence58, yes I can understand that plotting in an infinite value would completely skew the range of plot in order to plot all values. Are you able to share the qctools report in xml.gz form?

[Lawrence58]

Hello Dave. Thank you for looking into this. Here is the file.

14565_PSNRf2.mov.qctools.xml.gz
Copyright SYDA Foundation

[Lawrence58]

Any chance there is a formula I can use to edit the bar chart with? The only workaround I can come up with is to edit the offending parts out of video files so I can see the PSNRf waveform. But, that is not sustainable because I am working with 100s of files per week. Thx.