To transcode – or not to transcode?

Transcode - or not
There are a lot of misconceptions about transcoding, and discussions on transcoding show up in forums and groups quite often. In an attempt to bring some facts and practical advice on the table, I did a test.

The Myth I’m busting: Transcoding your 8-bit source material to 10-bit will magically make it more robust, so you can do heavy color grading in Premiere with better results.

I added some heavy contrast adjustment in RGB Curves to an 8-bit H.264 DSLR footage (from a Canon EOS 7D camera). I also added the same adjustment to a 10-bit DNxHD (DNX HQX) transcoded copy of the file. Here are the results.

Result of transcoding test

I also tried Cineform 10-bit and ProRes 422 HQ. They all show the same problem. The 10-bit copy has more banding and blocking than the original.

Conclusion: You should not transcode to 10-bit to get better results after color grading

I was asked to be a guest blogger on ProVideo Coalition, and you can read the whole article, learn why it’s a bad idea to transcode, and watch more video examples on their site.

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2 Responses

  1. Sherzat says:

    super)))

  2. Nate says:

    I think for a lot of people, the appeal to transcoding DSLR footage to DNxHD or ProRes is that it’s less taxing for computers to work with uncompressed material in the timeline. Not an issue for most systems, but if you’re on something with lower specs it could make a big difference.
    Didn’t realize there were that many people out there who were convinced you’re getting the extra bit depth this way 😛

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