Hello, it's me again w/another question about ffmpegX. i was doing more test conversions, this time from a .dv file to .3gp. After the conversion process was completed, i played the .3gp output file & found that the picture was rather "pixelated"--sort of blocky looking, w/somewhat large size squares rather than the finer resolution i would hope for & which was on the source .dv file--i'm not sure if that is the right terminology, but i don't know how else to describe it. Are there parameters or settings in ffmpegX that i can tweak or adjust to get better picture resolution in the output? Thanx again.
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Welcome to 3gp, isn't it grand? Seriously though, 3gp is very low bitrate indeed, the compromise that will give the biggest bang for the buck increase in quality is to reduce the frame rate on the output. 15 or even 12fps, on a cell phone size screen it will look ok. I'm not sure what verizon uses for vcast tv but I do believe they output 30fps but at a higher bitrate. If your target device can handle h264 then give that a shot at the same sizes, it might be ok. Hope this of some help.
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1/ Set the Video Size to the native resolution of of your viewing device (phone?). If yours support 320x240, then change that from the default 176x144.
2/ The default bitrate is quite low to get small files. Use the Best button in the bitrate calculator to get an optimized (higher) bitrate.
3/ In the Options tab, you could tweak the quantizer setting, which relates to quality range to use. Lower values mean better quality. Set Qmax to a lower value to improve the quality. Setting both Qmin and Qmax to 2 would encode about as good as it can get. Setting a Qmax anywhere between 2 and 24 will give some in-between quality.
• More quality will result in larger files. Even fancy mobiles have a maximum memory storage.
• The effective bitrate should stay below the maximum of your mobile, or the file will not play (well).
Some samples:
a. Default bitrate of 30 kbps; Qmin=2, Qmax=24; output filesize norm at 100%.
b. 'Best' bitrate set to 68 kbps; Qmin=2, Qmax=24; output filesize at 164%.
c. Qmin=2, Qmax=2; bitrate value ignored; output filesize at 476%.
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Originally Posted by fugu
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Originally Posted by Case
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Originally Posted by Case
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Originally Posted by SnakeGirl
For testing purposes, it may be a good idea to take a short clip, to cut down on encoding time.
I expect 176x144 to be the maximum video size, but you could try and see what happens with 220x176 videos.
Originally Posted by SnakeGirl
Originally Posted by SnakeGirl -
Originally Posted by Case
i do have a question about the Process Information though, i noticed there were a number of warning messages in it:
Encoding started on Mon Jan 21 00:40:06 PST 2008
FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
Mac OSX universal build for ffmpegX
libavutil version: 49.0.0
libavcodec version: 51.9.0
libavformat version: 50.4.0
Input #0, dv, from '/Users/Princess/Movies/Belly Dance/Elektra/Elektra (Miscellaneous).dv':
Duration: 00:13:27.1, start: 0.000000, bitrate: 28771 kb/s
Stream #0.0, 29.97 fps(r): Video: dvvideo, yuv411p, 720x480, 28771 kb/s
Stream #0.1: Audio: pcm_s16le, 48000 Hz, stereo, 1536 kb/s
Output #0, 3gp, to '/Users/Princess/Movies/Belly Dance/Elektra/Elektra (Miscellaneous).dv.ff.4.3gp':
Stream #0.0, 12.00 fps(c): Video: h263, yuv420p, 176x144, q=2-2, 68 kb/s
Stream #0.1: Audio: amr_nb, 8000 Hz, mono, 12 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
[h263 @ 0x45a630]warning, clipping 1 dct coefficients to -127..127
[h263 @ 0x45a630]warning, clipping 1 dct coefficients to -127..127
[h263 @ 0x45a630]warning, clipping 1 dct coefficients to -127..127
[h263 @ 0x45a630]warning, clipping 1 dct coefficients to -127..127
[h263 @ 0x45a630]warning, clipping 1 dct coefficients to -127..127
[h263 @ 0x45a630]warning, clipping 1 dct coefficients to -127..127
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(a whole bunch of the same warning msgs. repeating in here ...)
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[h263 @ 0x45a630]warning, clipping 1 dct coefficients to -127..127
[h263 @ 0x45a630]warning, clipping 1 dct coefficients to -127..127
[h263 @ 0x45a630]warning, clipping 1 dct coefficients to -127..127
[h263 @ 0x45a630]warning, clipping 1 dct coefficients to -127..127
[h263 @ 0x45a630]warning, clipping 1 dct coefficients to -127..127
[h263 @ 0x45a630]warning, clipping 1 dct coefficients to -127..127
video:59683kB audio:1261kB global headers:0kB muxing overhead 0.389711%
bench: utime=289.047s
Encoding completed on Mon Jan 21 00:54:44 PST 2008
What do these warning msgs. mean & do i need to do anything to eliminate them? The output video appears to be fine as far as i can tell & is plenty good enough quality for playback on my phone. -
Originally Posted by SnakeGirl
Originally Posted by SnakeGirl
The log is telling what the encoder is doing. The warning is just telling that it couldn't handle some of the numbers it is dealing with, and is changing values in order to cope with them, in the best way it can do that. Nothing to worry about, nothing you can do about it either...
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