If you preview Canon EOS DSLR .MOV video files on a PC, It's worth checking that the video player you use on your PC is actually playing your video correctly...
After experiencing incorrect playback of video files from my 600D (T3i), in terms of wondering why all my footage looked wrong in terms of contrast and crushed blacks when played back on my Win7 PC. I dug a little deeper....
I saw that if I tried to play back a .MOV video file from my Cannon 600D (T3i) on my Win7 PC using Windows Media Player (v11) or VLC player, it played the video levels back incorrectly, in terms of the blacks getting crushed (resulting in a video playback that looked too dark).
This was due to the 0-255 range of the video being incorrectly expanded by the PC player and the blacks (and whites?) getting clipped.
As a secondary and seperate issue, I also realised that if I try to render out a Sony Vegas Studio 8-bit timeline to H264 without first applying a 'Computer RGB to Studio RGB levels' FX to the Cannon .MOV clips in the Vegas Studio timeline, then the resulting H264 .mp4 output render would be incorrect in terms of the 0-255 levels being incorrectly encoded and the blacks being crushed.
The video above shows;
First clip - an EOS video clip being played back by Windows Media Player (video above shows a screengrab from WMP). Note how dark the shadows are and how detail is lost from the shadows. This is due to WMP incorrectly scaling the video levels of the EOS .MOV video and playback being incorrect.
Second - an EOS video clip that has been rendered to H264 by Sony Vegas Studio v12. With a 'Computer RGB to Studio RGB levels' FX applied to the Cannon .MOV clip in the Vegas Studio timeline. this results in correct encoding and the resulting render also plays back ok in all the players on my PC (ie. rendering without a 'Computer RGB to Studio RGB levels' FX first being applied, results in incorrect encoding by Sony Vegas Studio and incorrect black levels)
Third - an EOS .MOV file placed straight onto a Premiere Pro CS6 timeline with no FX applied, rendered straight out to H264 .mp4. The resulting render is 100% ok and also plays back ok in all the players on my PC
For more detail and background see this thread at magiclantern.fm/forum/index.php?topic=3080.msg14474#msg14474
Video in examples shown is unprocessed, shot with a flat/neutral profile and with no sharpening etc applied.
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