search for: target_bitrate

I've got my encoder working now... and i put a proeprty page interface to allow the user to set a few encoding paramters to start off with... but changing the paramters doesn't seem to make barely any difference... These are the defaults i'm using... mTheoraInfo.target_bitrate=400000; mTheoraInfo.quality=30; mTheoraInfo.dropframes_p=0; mTheoraInfo.quick_p=1; mTheoraInfo.keyframe_auto_p=1; mTheoraInfo.keyframe_frequency=64; mTheoraInfo.keyframe_frequency_force=64; mTheoraInfo.keyframe_data_target_bitrate=mTheoraInfo.target_bitrate*1.5; mTheoraInfo.keyframe_auto_threshold=...

...th=176; m_ti.frame_height=144; m_ti.offset_x=0; m_ti.offset_y=0; m_ti.fps_denominator=(ogg_uint32_t)1000000.0; m_ti.fps_numerator=10 * m_ti.fps_denominator; //10 is 10 frames per second m_ti.aspect_numerator=1; m_ti.aspect_denominator=1; m_ti.colorspace=OC_CS_UNSPECIFIED; m_ti.target_bitrate=0; // 0 if we are specifying quality m_ti.quality=5; // from 0 to 10, 10 is highest quality but higher files m_ti.dropframes_p=0; m_ti.quick_p=1; // should always be 1 m_ti.keyframe_auto_p=1; m_ti.keyframe_frequency=64; m_ti.keyframe_frequency_force=64; m_ti.keyframe_data_targe...

...the quality of the network experienced. My goal was to use the open-source Theora codec for video transmission. Unfortunately, it seemed that Theora 1.0 did not properly implement any correct CBR mode. The encoding rates can be adjusted "on-the-fly" during encoding by adjusting the "target_bitrate" and the "keyframe_target_bitrate" variables of the "theora_info" structure, but the resulting average bitrate is largely below the target bitrate desired. Furthermore, the bitrates vary depending on the amount of motion captured, which is a typical VBR feature. Here are t...

...I'm currently working on implementing Theora Video playback for the Unity engine (http://www.unity3d.com). So far everything works fine, But I have a small question: Is there a reliable way to predict what bitrate a stream will have when encoding or decoding? Of course, there's the target_bitrate parameter in the Theora Info structure, but somehow, I always get quite different bitrate results for my encodings (typically about half as much). Is the quality parameter ignored when target_bitrate is non-zero? I'd like to have some idea of what I will get, so I can present the user w...

...ti.pic_x = 0; ti.pic_y = 0; ti.fps_numerator = 30; ti.fps_denominator = 1; ti.aspect_numerator = 0; ti.aspect_denominator = 0; ti.colorspace = TH_CS_UNSPECIFIED; ti.pixel_fmt = TH_PF_422; ti.target_bitrate = -1; ti.quality = 48; ti.keyframe_granule_shift=ilog(keyframe_frequency-1); What can cause such a problem? Regards Mario

...rint(atof(optarg)*1000); if(video_r<45000 || video_r>2000000) { fprintf(stderr,"Illegal video bitrate (choose 45kbps through 2000kbps)\n"); exit(1); } video_q=0; break; I assume 'kbps' is Kilobits Per Second (kbit/s) and *theora_info.target_bitrate* is in Bits Per Second. If this is true then shouldn't the argument (optarg) be multiplied by 1024 and not 1000? Or does it matter? Thanks, Draco draco@dragonsguild.net -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/piperm...

...meters: ti.fps_numerator = fps * 11 + 1; // var framerate ti.fps_denominator = 11; ti.aspect_numerator = 1; ti.aspect_denominator = 1; ti.colorspace = OC_CS_ITU_REC_470BG; // OC_CS_UNSPECIFIED; ti.pixelformat = OC_PF_420; ti.target_bitrate = 0; ti.quality = 1 * 6.3; ti.dropframes_p = 0; ti.quick_p = 1; ti.keyframe_auto_p = 1; ti.keyframe_frequency = 64; ti.keyframe_frequency_force = 64; ti.keyframe_data_target_bitrate = ti....

...ytes per second from the information passed in the th_info-struct to the Theora encoder's th_encode_alloc()? I'm trying to be able to give users a rough estimate of the file size needed to encode with the setting provided to th_info-struct (frame width/height, fps_numerator/fps_denominator, target_bitrate and quality). -- Bjoern _________________________________________________________________ NY Windows Live Messenger med nye fede funktioner. Hent den her! http://download.live.com/messenger

...nit(&enc_stream, 290482); enc_width = width; enc_height = height; theora_info ti; theora_info_init(&ti); ti.width=width; ti.height=height; // must be /16 ti.frame_width=width; ti.frame_height=height; ti.offset_x=0; ti.offset_y=0; ti.colorspace=OC_CS_UNSPECIFIED; ti.target_bitrate=bitrate; ti.dropframes_p=0; ti.quick_p=1; ti.keyframe_auto_p=1; ti.keyframe_frequency=64; ti.keyframe_frequency_force=64; ti.keyframe_data_target_bitrate=bitrate*1.5; ti.keyframe_auto_threshold=80; ti.keyframe_mindistance=8; ti.noise_sensitivity=1; theora_encode_init(&enc_...

...D64? - CPU optimisations... they are enabled by default, right? - Encoding parameters... now I use: ... theora_info tTheoraInfo; tTheoraInfo.colorspace = OC_CS_ITU_REC_470BG; /* OC_CS_UNSPECIFIED ? */ tTheoraInfo.pixelformat = OC_PF_420; tTheoraInfo.target_bitrate = 0; tTheoraInfo.quality = 15; tTheoraInfo.dropframes_p = 0; tTheoraInfo.quick_p = 1; tTheoraInfo.keyframe_auto_p = 1; tTheoraInfo.keyframe_frequency = 64; tTheoraInfo.keyframe_frequency_force...

Hello, I've built my own source for ICE/SHOUTcast, and it works pretty well except for one thing. After tuning into the server and listening for an 60-90 minutes you may hear a song skip ahead 30-90 seconds. I think I know why this is happening but I'mnot sure how to fix it. I think this is happening because my source is sending a little bit too much data to ICE/SHOUTcast. My formula

...= iVideoFPSnum; tTheoraInfo.fps_denominator = iVideoFPSden; tTheoraInfo.aspect_numerator = iVideoAspNum; tTheoraInfo.aspect_denominator = iVideoAspDen; tTheoraInfo.colorspace = OC_CS_UNSPECIFIED; tTheoraInfo.pixelformat = OC_PF_420; tTheoraInfo.target_bitrate = iVideoBitrate; tTheoraInfo.quality = iVideoQuality; tTheoraInfo.dropframes_p = 0; tTheoraInfo.quick_p = 1; tTheoraInfo.keyframe_auto_p = 1; tTheoraInfo.keyframe_frequency = 64; tTheoraInfo.keyf...

...39;s media formats incidently). But your algorithm will suffer because sending the data will take a non-negligible time - better algorithm is tart = time(); sent = 0; while(1){ sent += send_chunk(); delta = time() - start; my_bitrate = sent *8 / delta; if(my_bitrate> target_bitrate){ sleep(1); /* (or any short time)*/ } } you maybe want to reset the sent/start parameters periodicly. Scott Manley --- >8 ---- List archives: http://www.xiph.org/archives/ icecast project homepage: http://www.icecast.org/ To unsubscribe from this list, send a message to &...

...| PARN: aspect_numerator | 28-31 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | PARD: aspect_denominator | 32-35 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | CS: colorspace| NOMBR: target_bitrate | 36-39 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | QUAL | KFGSHIFT| PF| resv| 40-43 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ Conrad. --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepag...

...// guess not, commandline option to select colorspace would be the best. if(this->fps==25) info.ti.colorspace = OC_CS_ITU_REC_470BG; else if(abs(this->fps-30)<1) info.ti.colorspace = OC_CS_ITU_REC_470M; else info.ti.colorspace = OC_CS_UNSPECIFIED; //FIXME: allow target_bitrate as an alternative mode //only use quality mode for now. //info.ti.target_bitrate=1200; info.ti.quality = this->video_quality; info.ti.dropframes_p = 0; info.ti.quick_p = 1; info.ti.keyframe_auto_p = 1; info.ti.keyframe_frequency = 64; info.ti.keyframe_frequency_force = 6...

...e_y_offset; videostream->ti.fps_numerator = refreshrate * 1000000; videostream->ti.fps_denominator = 10 * 100000; videostream->ti.aspect_numerator = 0; videostream->ti.aspect_denominator = 0; videostream->ti.colorspace = OC_CS_UNSPECIFIED; videostream->ti.target_bitrate = video_r; videostream->ti.quality = 1; videostream->ti.dropframes_p = 0; videostream->ti.quick_p = 1; videostream->ti.keyframe_auto_p = 1; videostream->ti.keyframe_frequency = 16; videostream->ti.keyframe_frequency_force = 16; videostream->ti.keyfr...

...i.offset_y = frame_y_offset; ti.fps_numerator = video_hzn; ti.fps_denominator = video_hzd; ti.aspect_numerator = video_an; ti.aspect_denominator = video_ad; ti.colorspace = OC_CS_UNSPECIFIED; ti.pixelformat = OC_PF_420; ti.target_bitrate = video_r; ti.quality = video_q; ti.dropframes_p = 0; ti.quick_p = 1; ti.keyframe_auto_p = 1; ti.keyframe_frequency = 64; ti.keyframe_frequency_force = 64; ti.keyframe_data_target_bitrate...

Hi. I'd like to ask a little about where Ogg stands today when it comes to streaming audio. The VBR has been the main argument in the incompatibility for streaming but has this changed somehow or will it? Is there something else besides quick and large scaled bandwith usage variations and the difficulty of buffering, that could cause problems? CBR could be used but some people say that it

...info.ti.dropframes_p = 0; info.ti.quick_p = 1; info.ti.keyframe_auto_p = 1; - info.ti.keyframe_frequency = 64; - info.ti.keyframe_frequency_force = 64; + info.ti.keyframe_frequency = this->keyint; + info.ti.keyframe_frequency_force = this->keyint; info.ti.keyframe_data_target_bitrate = info.ti.target_bitrate * 1.5; info.ti.keyframe_auto_threshold = 80; info.ti.keyframe_mindistance = 8; info.ti.noise_sensitivity = 1; + info.ti.sharpness = this->smoothness; // range 0-2, 0 sharp, 2 less sharp,less bandwidth - if(info.preset == V2V_PRESET_PREVIEW) + if(inf...