Comments on: PSP video guide

By: rob

rob — Tue, 15 Jun 2010 06:37:55 +0000

Oops. -b where that value is something reasonable for your content. Else you can use -crf if you prefer but you have to set the bufsize and maxrate.

By: sean darcy

sean darcy — Mon, 14 Jun 2010 23:31:11 +0000

Ok, libfaac it is.

Is the “-b” a typo, or do you really need to set the bitrate?

By: rob

rob — Mon, 14 Jun 2010 06:08:54 +0000

1. libfaac is still better quality than FFmpeg’s AAC encoder for the moment. Someone is working on it and we hope to beat FAAC soon.

2. I haven’t tested this (though I do have a PS3 now) but something like:

ffmpeg -i INPUT -acodec libfaac -ab 128k -vcodec libx264 -vpre slow -vpre high -level 41 -bufsize 40000 -maxrate 40000 -b outfile.mp4

As it supports Blu ray and this should be compliant with Blu ray on the video side at least. If you want to do two passes or so, you can check out the generic FFmpeg x264 encoding guide. The only restrictions I know of are H.264 High Profile at Level 4.1 which is pretty easy to attain. You do need to set the bufsize and maxrate though to increase the likelihood your encoded file will play. I think using crf mode is OK too as long as you set the bufsize and maxrate.

By: sean darcy

sean darcy — Sun, 13 Jun 2010 16:45:20 +0000

Two comments:

1. Why libfaac rather than aac? I thought aac was worked on to be “better” than libfaac?

2. I’m really looking for a PS3 command line. Here’s what I’ve come up with:
ffmpeg -i INPUT -acodec aac -ab 128k -vcodec libx264 -vpre slow -vpre high -level 42 -crf 17 OUTPUT.mp4

Googling has not been a great help. Any suggestions or a link?

By: Hyper Shinchan

Hyper Shinchan — Fri, 21 May 2010 01:12:48 +0000

Actually I must say that there are some weird limitations with the resolution, it seems that anything higher than 480x272p must be 480p, 640×480 is fine but 480×360 used by Youtube isn’t fine; I’ve also tested videos encoded with settings that worked at 720×480 and 640×480 but at 480×360 and 512×384 they didn’t work (probably because resolutions higher than 270p are mainly intended to be displayed on TV monitors and it would be harder for the PSP to resize them, I suppose it does so with some dedicated hardware routine, just like AVC decoding, and not via software).
So it should be safe to say that the supported resolutions are:
anything with vertical resolution ≤ 272 pixels and horizontal resolution ≤ 480 pixels (tested: 320×240; 480×240 and 480×272)
anything with vertical resolution of 480 pixels and horizontal ≤ 720 pixels (tested: 640×480 and 720×480)