Date: Mon, 8 Sep 2003 00:28:53 +0900 (JST) From: sugiura@kt.rim.or.jp (Sugiura Shiro) To: steve@sohara.org, freebsd-multimedia@freebsd.org Subject: Re: How to make high quality MPEG4 video Message-ID: <200309071528.AAA16436@mail4.rim.or.jp> In-Reply-To: Your message of "Tue, 2 Sep 2003 18:37:09 %2B0200". <20030902183709.7534858c.steve@sohara.org>
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In article <20030902183709.7534858c.steve@sohara.org> steve@sohara.org writes: >> SS> I tried to direct encode a sportscast like following: >> SS> >> SS> % ffmpeg -s 640x480 -tvstd ntsc -vcodec mpeg4 -b 2000 -acodec mp3 -ac >> SS> 2 \ >> SS> -ab 128 -f avi TV.avi >> SS> >> SS> It uses about 30% CPU on average. >> >> That seems too low. What version of FreeBSD are you running ? >> There was an update merged to stable on 17 June this year that fixed a >> nasty problem with the bktr sync signalling at full resolution YUV. I use 5.1-CURRENT-20030812. I tried to turned off HTT on BIOS, and rebuild kernel without SMP , then it likes so better. ------------------------------------------------------------------------- (1)% ffmpeg -r 29.97 -s 640x480 -ac 2 -ar 48000 -ab 256 -acodec mp3 -vcodec \ mpegvideo -b 8000 -tvstd ntsc tv.mpg PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND 648 sugiura 8 0 11912K 10256K nanslp 0:52 49.88% 49.61% ffmpeg (2)% ffmpeg -s 640x480 -tvstd ntsc -vcodec mpeg4 -b 2000 -acodec mp3 -ac 2 \ -ab 256 -r 29.97 -f avi TV.avi PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND 657 sugiura 100 0 13092K 11588K RUN 1:47 36.77% 36.77% ffmpeg (3)% ffmpeg -r 29.97 -s 640x480 -ac 2 -ar 48000 -acodec pcm_s16le -vcodec \ rawvideo -tvstd ntsc TV.avi PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND 685 sugiura 8 0 10064K 7216K nanslp 0:12 13.83% 13.62% ffmpeg ------------------------------------------------------------------------- I recorded TV like (3) , then I want to encode to MPEG4 using ffmpeg. But, I can't encode like following; ------------------------------------------------------------------------- % ffmpeg -t 30 -r 29.97 -s 640x480 -ac 2 -ar 48000 -acodec pcm_s16le \ -vcodec rawvideo -tvstd ntsc TV.avi % ls -al TV.avi -rw-r--r-- 1 sugiura users 420572266 Sep 8 00:15 TV.avi % ffmpeg -i TV.avi -b 2000 -vcodec mpeg4 -acodec mp3 -ac 2 -ab 128 TV2.avi Input #0, avi, from 'TV.avi': Duration: 00:00:30.0, bitrate: 112040 kb/s Stream #0.0: Video: rawvideo, yuv420p, 640x480, 29.97 fps Stream #0.1: Audio: pcm_s16le, 48000 Hz, stereo, 1536 kb/s Output #0, avi, to 'TV2.avi': Stream #0.0: Video: mpeg4, 640x480, 29.97 fps, q=2-31, 2000 kb/s Stream #0.1: Audio: mp3, 48000 Hz, stereo, 128 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 Press [q] to stop encoding frame= 3 q=2.0 size= 776kB time=0.1 bitrate=63493.3kbits/s ----------------------------------^^^^^^^^------------------------------- Only 0.1 sec "time" ???? ------------------------------------------------------------------------- % ls -al TV2.avi -rw-r--r-- 1 ssugiura users 814516 Sep 8 00:15 TV2.avi ------------------------------------------------------------------------- TV2.avi file is too small, and I can't playback TV2.avi with mplayer. Is there any options to encode MPEG4? -- Sugiura Shiro E-mail : sugiura@kt.rim.or.jp
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