USBCameraTest3 just can display the first frame

[saki4510t]

USBCameraTest3 just can display the first frame

[saki4510t]

Hi,
Thank you for providing feedback. As I tested on my devices, the sample projects works well and your log shows no problem. So could you provide more details?

If you modified something, could you try original one?
If you can see preview images until you touch record button, the issue may relate to MediaCodec.
Do you use old SAMSUNG devices like GALAXY S2/S3 etc.? Those devices have some issue on MediaCodec and will need to add some workaround.

If you un-filter logCat, you may be able to see additional log related to the issue.
saki

[0x7962]

thanks for reply, Exactly i test on 'samsung 4412', it seems to GALAXY S3. i will test on the other platform (samsung 6818 /4418 or rockchip ..)

[0x7962]

Hi,
i tested on samsung 6818 device is ok(test3/7),but the rockchip device can't display anything..

[saki4510t]

Hi,
Almost all devices which SOC/chipset is made by Rockchip, MediaTek and Allwinner have issues on their hardware/system software and app will freeze, crash, ANR, reboot... If you use those device I assume it will be better to give up to use UVC camera with those devices.
I had request them to fix the issues but there are no response.

I also have S3 and it's problem is different from others and related to MediaCodec. Some MediaCodec API is extremely slow(almost hung-up) on the device under some conditions...
Try to temporary increase thread priority to maximum while preparing MediaCodec.
Additionally, if you use Android 4.3 or prior, you need special handling when start MediaCodec because it never return MediaCodec.INFO_OUTPUT_FORMAT_CHANGED and use MediaCodec.BUFFER_FLAG_CODEC_CONFIG instead. And you need to extract PPS/SPS and contract MediaFormat instance and pass it to muxer by yourself.
saki

[0x7962]

Hi,saki
at first,thanks for your help so much!
i have a doubt, whether must use the 'MediaCodec' when i use two cameras? because, i preview the second camera just by TextureView there was an error

[1565_diag.c:88:uvc_perror]:failed start_streaming:I/O error (-1)

[0x7962]

i was wrong, I replaced the camera after is OK