问题
I'm working on an app which encodes a movie using h.264 encoder to gallery and other targets. This app supports variable aspect ratios at output (1:1, 2:3, 3:2, 16:9, 3:4, 4:3). I'm using surface inputs for input/output from the 4.3 API.
The app works ok on many devices (tested on S3, Motorola G, Nexus 7 2012, Motorola X), however, I've hit a wall when running it on Nexus 7 2013.
Basically, some output resolutions work, some do not. 3:4 (720x960), 2:3 (720x1080) and 16:9 (1280x720) work as intended, but the rest (1:1 (960x960), 3:2 (1080x720) and 4:3 (960x720)) produce an output like this:
http://imageshack.com/a/img811/7984/dtgh.png
My guess is that there is some value hard coded in the encoder which treats its input surface as having a different width than it actually has - the pixel lines seem to "not line up correctly". However, I am at a loss at what can cause this and how to work around it.
There are no errors in the log and the video encoder codec outputs in the log the correct surface width and height when outputing the media format.
update: seems there are no issues when encoding with 360, 720 or 1280 width, with height having no impact. I haven't found any other widths below 1280 that work.
update2: seems there are more widths that work: 180, 240, 640, 700. Couldn't find any correlation between them.
来源：https://stackoverflow.com/questions/22579865/nexus-7-2013-mediacodec-video-encoder-garbled-output