Video, audio and metadata quality assurance (QA) happens at many points along the production pipeline, but falls into three broad categories: live signal, file check and compression quality. Drastic provides cost effective tools for each of these workflows.
Live Signal QA
Live signal quality assurance generally relies on dedicated waveform and vector scope hardware that is single purpose and quite expensive. 4KScope provides a cost effect alternative for workflows that do not require constant monitoring and where there is a video I/O board available. 4KScope is available as an SD/HD/Digital Cinema version, or as a pro version that supports signals up to 4096x2116. 4KScope provides a vector scope, YCbCr waveform, RGB waveform, RGB histogram and safe zone picture in native YCbCr or RGB at up to 10 bits of resolution per component. 4KScope also has built in 608/708 closed captioning with text preview overlay and support for up to 16 audio channels.
File Check QA
DrasticPreview is the most cost effective visual and aural file check available today. It has extensive file support, including high end post production formats such as: MXF (Omneon, P2, Sony HDCam/XDCam/F65, Avid, DCI Unencrypted, etc), OMF, CINE, DPX, FHG, R3D, DNG, MOV, AVI, TIFF, TGA, GEN, HDR, VPB, YUV, V210 and many more. It plays them directly to the VGA and PC speakers. There is access to extensive metadata from the files, automatic stitching of audio and sidebar files, real time data like LTC/VITC time code/userbits/frame count, optional big time code display with cut/paste support, Contour controller support and file format information.
MediaNXS is the next logical step up from DrasticPreview for file QA. It supports the same files as DrasticPreview, but adds HD-SDI out from a supported AJA or BlueFish444 board, a full signal measurement suite including vector scope, waveform and histogram, and the ability to export the file to tape and/or convert it to other file formats. Aside from single file checks, groups of files may be lined up on the time line and checked, or exported to tape or file, allowing for adding and aligning of non automatic audio sources, like broadcast wave files from the set.
Compression Quality QA
MediaReactor has always included an optional PSNR check for compressed files. This capability has been broken out to make it available to the user. MRAnalyze is a command line tool that can perform PSNR, SSIM or MS-SSIM video comparisons between a source file and its compressed version. It outputs a CSV file with all the file information, a pass/fail and the comparison value for each frame, suitable for bringing into a spreadsheet for making charts and further analysis. Because MRAnalyze is based on MediaReactor, it natively supports all the file formats MediaReactor supports. It can still be used as a final check for MediaReactor translations, or it can be automated to check translations of any compression software.
Usage: mranalyze -a <source a> -b <source b> -q -p # -s # -m # -g # -f # -l # -x # -n # [-o <targetfile>]
- -a <source a> Original file.
- -b <source b> Compressed file.
- -q Quiet (no output) must be first argument.
- -p # PSNR type
- -s # SSIM type (0-Square, 1=Guassian)
- -m # MS-SSIM type
- -g # Global checks (0-none, 1-basic, 2-advanced)
- -f # First frame to check
- -l # Last frame to check
- -x # B source first frame to check
- -n # Next frame distance (def 1 = every frame)
- -o [targetfile] Optional, csv output name (or '-o i' to generate the file name)