Doom9's Forum - View Single Post - iPad 3/HD/2012/"New" h.264 encoder settings

Kisa_AG · 30th March 2012, 14:42

Hello Gentlemens!

I also trying to find good encoding settings to encode 720p25 and 1080p25 for IPAD 3. But I decided to use MP4 as a container.

I started with the following string:

x264 --bitrate 7000 --preset veryslow --tune film --vbv-maxrate 10000 --vbv-bufsize 10000 --level 4.1 --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1

and it seems to play smoothly on IPAD. But during play on IPAD I see blocking on some "fast" frames.

What options should I add to this string to make the encoding more adequate?

Is it make sence to use --nal-hrd vbr, for example, or --bluray-compat, or to use --keyint parameter, or --open-gop?

The second task for me is to add 720p50 to IPAD, but iTunes doesn't allow me to import such mp4 to IPAD. But I know that IPAD CAN play such files because when I added 720p50 video from GoPro camera thrue Camera Connection Kit, IPAD play it smoothly without any problems.
So it would be great if you have any suggestions for encoding string for 720p50.

30th March 2012, 14:42	#19 \| Link
Kisa_AG Registered User Join Date: Sep 2005 Location: Moscow, Russia Posts: 66	Hello Gentlemens! I also trying to find good encoding settings to encode 720p25 and 1080p25 for IPAD 3. But I decided to use MP4 as a container. I started with the following string: x264 --bitrate 7000 --preset veryslow --tune film --vbv-maxrate 10000 --vbv-bufsize 10000 --level 4.1 --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1 and it seems to play smoothly on IPAD. But during play on IPAD I see blocking on some "fast" frames. What options should I add to this string to make the encoding more adequate? Is it make sence to use --nal-hrd vbr, for example, or --bluray-compat, or to use --keyint parameter, or --open-gop? The second task for me is to add 720p50 to IPAD, but iTunes doesn't allow me to import such mp4 to IPAD. But I know that IPAD CAN play such files because when I added 720p50 video from GoPro camera thrue Camera Connection Kit, IPAD play it smoothly without any problems. So it would be great if you have any suggestions for encoding string for 720p50.