I tried porting my windows opencv application to my linux board, olimex a20 (armhf) and i get, No accelerated colorspace conversion found from yuv420p to bgr24 warning continuously when reading an mp4 or avi file. And performance is extremely poor. After a bit of searching i found that the problem is with ffmpeg, so i manually built ffmpeg to the latest snapshot,
libavutil 55. 11.100 / 55. 11.100 libavcodec 57. 20.100 / 57. 20.100 libavformat 57. 20.100 / 57. 20.100 libavdevice 57. 0.100 / 57. 0.100 libavfilter 6. 21.101 / 6. 21.101 libswscale 4. 0.100 / 4. 0.100 libswresample 2. 0.101 / 2. 0.101 libpostproc 54. 0.100 / 54. 0.100
but still it didnt help. Then i compiled opencv 3.0.0 on the board. But still the problem persists. Please help!