Thank you, Benjamin! I was doing any similar, but used 3 bits/pixel instead 0.22. At now I try to 0.22 and quality is very bad. As I understand optimal bpp depends on compression format. For uncompressed RGB needed 24 bpp, but how to know, what's optimal for concreate codec?
On Tue, Sep 14, 2010 at 1:46 PM, Benjamin Gretsch <[email protected]> wrote: > For average to good quality you should have between 0.15 and 0.22 > bits/pixel > (bpp). > Use the formula > bpp = bps / (width * height * fps) > <=> bps = bpp * width * height * fps > > bps is bits/s (bitrate), fps is frames/s > > > Am 14.09.2010 11:26, schrieb Kulti: > > Hi, all. > > > > I used add_video_stream() function from output_example.c for > > tuning AVCodecContext. bit_rate field is set to some value, but I can't > > understand what value I need? How to calculate output bit-rate for my > > concrete format and width x hight? > > > > May be ffmpeg can automatically set optimal bit-rate? I try to set this > > field to 0, but it was not work. > > _______________________________________________ > > libav-user mailing list > > [email protected] > > https://lists.mplayerhq.hu/mailman/listinfo/libav-user > > > _______________________________________________ > libav-user mailing list > [email protected] > https://lists.mplayerhq.hu/mailman/listinfo/libav-user > _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
