#11317: Can AVCodec provide more crop information when decoding via MediaCodec?
-------------------------------------+-------------------------------------
Reporter: lanczos- | Type: defect
algorithm |
Status: new | Priority: normal
Component: avcodec | Version:
Keywords: mediacodec | unspecified
crop | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
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
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11317>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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