Hi everybody, this is my first message, I hope I'm in the right place to ask this question: which (and how) parameters of AVCodecContext should I set to obtain a h264 video with constant bit rate?
I've started with libavformat/output-example.c and I've modified it to have a h264 video, with the following parameters (besides the ordinary ones), that are working fine for non-CBR mode (please note that if I remove any of these i get the famous "broken ffmpeg default settings detected" error): AVCodecContext *c; c->qcompress = 0.6; c->qmin = 10; c->qmax = 30; c->max_qdiff = 4; c->i_quant_factor = 0.71; Then I've tried to change values of the above parameters as: c->qcompress = 0.0; c->qmin = 10; c->qmax = 10; c->max_qdiff = 0; c->i_quant_factor = 0.01 AND to set many values of many combinations of these parameters: crf, bit_rate, bit_rate_tolerance, rc_buffer_size, rc_max_rate, rc_min_rate, rc_max_available_vbv_use, rc_min_vbv_overflow_use but I'm still unable to get a video with CBR: when I run my program, at the end of the processing, when libx264 prints the informations about the video, there's "kb/s:inf" and in the property of the file created there's "Bitrate: N/A". I've tried many different combinations of settings with these parameters and now I really don't know what else to try, so I hope you can help me. Thanks in advance and greetings. -- View this message in context: http://libav-users.943685.n4.nabble.com/AVCodecContext-parameters-for-h264-encoding-with-CBR-tp3084884p3084884.html Sent from the libav-users mailing list archive at Nabble.com. _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
