Can AVCodec provide more crop information when decoding via MediaCodec?

[lanczos-algorithm]

I'm using an Android single-board computer based on Allwinner H618 to decode RTP stream and display it. When decoding a video stream using FFMPEG with HW MediaCodec, the frame parameters change from 1280x720 to 1280x736 at startup without any action on my part:

07-06 09:59:28.814  2158  2199 D SurfaceUtils: disconnecting from surface 0xee2fac08, reason setNativeWindowSizeFormatAndUsage
07-06 09:59:28.815  2158  2199 D SurfaceUtils: connecting to surface 0xee2fac08, reason setNativeWindowSizeFormatAndUsage
07-06 09:59:28.815  2158  2199 D SurfaceUtils: set up nativeWindow 0xee2fac08 for 1280x736, color 0x32315659, rotation 0, usage 0x402d00

07-06 09:59:28.876  2158  2204 D MyApp: FFmpeg: [h264_mediacodec @ 0xc7962500] Output MediaFormat changed to {crop-right=1279, color-format=842094169, slice-height=720, mime=video/raw, hdr-static-info=java.nio.HeapByteBuffer[pos=0 lim=25 cap=25], stride=1280, color-standard=1, color-transfer=3, crop-bottom=719, crop-left=0, width=1280, color-range=2, crop-top=0, height=736}
07-06 09:59:28.876  2158  2204 D MyApp: 
07-06 09:59:28.877  2158  2204 D MyApp: FFmpeg: [h264_mediacodec @ 0xc7962500] Output crop parameters top=0 bottom=719 left=0 right=1279, resulting dimensions width=1280 height=720
07-06 09:59:28.877  2158  2204 D MyApp: 

Apparently, to align the dimensions to 32 pixels. The avcodec_receive_frame writes width, height = 1280x720 to AVFrame and as a result, libraries that use AVCodec incorrectly determine the correct texture size, because in the frame itself there is no information about 736 anywhere. Without any additional workarounds I get a green line at the bottom

[James]

PoC fix

[James]

Could you test the (Untested as i don't have the hardware for this) attached patch?

[lanczos-algorithm]

Thanks for the quick response, James. I'm currently working on the changes on my side and will test them, I'll let you know how it goes

[lanczos-algorithm]

Thanks James, your patch helped!

JFYI. To make everything work, I added to my code next option:

av_opt_set_int(codec_ctx, "apply_cropping", 0, 0)