Strange artefacts in high bitrate WMV files created using ffmpeg

or “catchy post title #189”.

I generate the WMV version of our LUG talk videos using ffmpeg. In order to produce a higher quality version of a recent talk, I wanted to create the WMV at full PAL resolution, using a relatively high video bitrate of 900kbps. So, I took the MPEG2 file and ran:

ffmpeg -i input.mpeg -vcodec wmv2 -b 900 -acodec mp3 output.asf

At bit-rates over 600kbps on the large files, I get strange artefacts in the video – blocks missing, strange “deja-vu” repeats. At the same resolution at lower bitrates, it’s not a problem. Even a different MPEG2 (recorded using the same DV camera and processed in the same way) doesn’t have the problem. This is very odd. Does anyone have any ideas?

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    One Response to Strange artefacts in high bitrate WMV files created using ffmpeg

    1. oli44 says:

      Hi!

      a friend o mine told me the same lately, with ffmpeg from the cvs. You’re not alone, Tony!

      Maybe it’s time to investigate and file a bugreport?

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