We're aware that we have issues detecting the correct aspect ratio in v2.8 HLS content. We've fixed some of these issues and will be rolling out the patch over the next week (build 1158).
However, we're also aware that there is some content that this patch does not fix. We'd like to gather a more comprehensive list of good test content that exhibits any HLS aspect ratio issues in v2.8. Please post links here and will add them to our test suite as we work towards another fix.
As someone in the general forum mentioned, files encoded with HandBrake using the default ffmpeg mp4 codec appear squished. Files encoded with the x264 codec do not. I guess this begs the question, are the files with the ffmpeg mp4 codec supported?
Here's two relatively small (3 MB) files that can be downloaded that illustrate the problem: mp4 x264
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Here's another set of test videos (created with Handbrake). They are two versions of the same video; all encoding settings are identical except for the video codec. I have today's update (2.8 b1158) installed. The MPEG-4 is squished when played on MyMedia, but the H.264 video plays just fine.
All 88 of my transcodes were done with handbrake v0.9.4 using ffmpeg v0.6 as it is several times faster than x264 on SMP hardware. They are a mix of yuv420p (movie and TV series DVD library) at 29.97/23.98fps, ac3/aac (most 2 ch stereo), 720x400 [PAR 1:1 DAR 9:5] and 640x480 [PAR 1:1 DAR 4:3].
Since 2.8, not one displays correctly. Note the squash effect can be visually simulated by opening the mp4 in vlc and selecting
Video -> Aspect Ratio -> 1:1
which may point at how 2.8 interprets 1:1 pixel aspect ratio source (compared to 2.7).