Transcoding to H264 questions

[jockyw2001]

I've developed a vlc client called "PMP VLC" for Sony PSP.
(http://forums.ps2dev.org/viewtopic.php?t=6053)

With the app PSP users can view video streams via wlan. The transcoding is done in real-time by vlc 0.8.5 on a PC.

Currently a good quality can be achieved with following transcode params:

Code: Select all

:sout=#transcode{vcodec=DIV3,vb=700,width=360,height=272,fps=25,acodec=mp3,ab=48,channels=2}:duplicate{dst=std{access=http,mux=ogg,url=0.0.0.0:1234}}

Since the PSP can do H264 decoding with dsp, I have started doing experiments with x264 (vcodec=h264). However, I have 2 problems:
1. it pushes my AMD 2400 cpu to 100% and the pc is not responsive anymore
2. the only http stream container for h264+mp3 which works seems to be .ts

My questions are therefore:
1. what x264 video encode settings can you recommend to reach a decent quality similar to DIV3@700kbs (360x272, 25fps) and a cpu load well under 100% (e.g. like with DIV3 around 60%)
2. can the ogg container work for http streaming? if not now perhaps in the future? is there another container which may work?

Thx in advance!

[dionoea]

Best way to know all that you ever wanted to know about x264 and using x264 in VLC is to come on #videolan (on Freenode) and ask Trax. He does transcoding tests for x264 all day long on computers with 2 or 4 CPUs for a dutch broadcasting company.

[jockyw2001]

I finally found parameters which work quite well for my purposes:

Code: Select all

:sout=#transcode{vcodec=h264,vb=600,width=360,height=272,fps=25,venc=x264{me=dia,subme=1,analyse=none,bframes=0,b-adapt=none,chroma-me=none,merange=12},acodec=mp3,ab=48,channels=2}:duplicate{dst=std{access=http,mux=asf,url=0.0.0.0:1234}}

EDIT: For PSP bframes should be 0