Description:
General discussion of the WebM project.
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how to set crf for vp8 encoder in ffmpeg programmatically?
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Hi guys, I've downloaded latest libvpx code and built it into ffmpeg, so that my application can use ffmpeg dlls. Vp8 encoding works correctly and my application can generate webm videos. But what I want to know is, how can I set crf when encoding? What I do in my application is just calling ffmpeg interface... more »
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Duration in the webm file.
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Hi,
I'd like to create a webm video from custom frames.
I created a Segment (m_Segment) with one videotrack. I set the
videotrack's framerate to 25.
Than I encoded the frame:
...
vpx_codec_encode(m_Encoder, m_Image, 0, 2000, VPX_EFLAG_FORCE_KF,
VPX_DL_REALTIME);
const vpx_codec_cx_pkt_t* packet;... more »
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Any VP9 anchor bitstreams?
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Are there any publicly-available anchors / test sequences encoded with VP9, with "best quality" encoding settings? I'd like to do some quality vs. bitrate comparisons with other codecs. Thanks Iain Richardson
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questions about vp8 RTP format
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Hi everyone, now i have trouble parsing RTP for vp8. in this document, [link] i have doubt about vp8 payload descriptor. 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ |X|R|N|S|PartID | (REQUIRED) +-+-+-+-+-+-+-+-+ X: |I|L|T|K| RSV | (OPTIONAL 1)... more »
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Rate Control Algorithm in VP8 Encoder
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HI All, I would like to understand the Rate control algorithm in VP8 encoder. I have looked into Rate control parameters (Mode(best. good and rt), Cpu usages). but i wanted to know complete algorithm. Is there any document which explains me how they cameup with some calculations to calculate *vp8_pick_frame_size(I, P farmes).*... more »
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How to generate a stream with Segmentation in VP9
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Dear All, I would like to generate a stream with segmentation support for VP9 Codec using vpxenc. Please let me know the configuration options. I have tried integrating the code of vp8_set_maps, but did not succeed. Thanks, Srinivas
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VP9 on-fly spatial resolution change support
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Dear all, This is regarding spatial resolution change for non-key frames. Is there any limit on resolution change in VP9 specification? In experimental code, we could able to find restriction on resolution change in height ( "assert(y_step_q4 <= 32)") But we could n't find any restriction on width.... more »
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can we please get 10bpc support in vp9?
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+oliver, webm-discuss, since this came up on that list today too
Hi Geoffrey,
Thanks for such a detailed and well considered post. I think there's a
lot to consider with 10 bit support, and a number of people have asked
for it, so it's certainly under consideration. It's going to be too
late to make it into the baseline feature set / profile of VP9. There... more »
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