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Questions tagged [vp9]

77 questions
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How to conver/compress VP9 video/Webm 12bit video to Webm 10bit video with ffmpeg?

I have tried to convert/compress webm 12 bit video to webm 10 bit, but I have not found right one command recipe. Best what I have become was: ffmpeg -i video.webm -c:v libvpx-vp9 -s 3840x2160 -b:a 2500000M -keyint_min 60 -g 60 -tile-columns 4…
Vladimir A.
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webrtc screen-sharing with VP9 - low fps

I'm testing browser screen-sharing in chrome using webrtc with VP9 codec. The problem is that encoding of sender's video has very low frame-rate - more or less 5fps. I'm not limiting it anywhere, here are my getDisplayMedia options: const stream…
Nicolas Migut
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How do I force Mediasoup to use vp9 codec?

We have an installation of Mediasoup working without problems. We are using a mediasoup version that is compatible with vp9 codec. The issue we have is that it uses h.264 codec by default and we run on bandwidth constrained environments and we need…
G A
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How to convert the AVPacket of ffmpeg to the webm stream with c++ code?

I am confused how to convert the ffmpeg AVPacket to a living stream in order to I can play it with HTML5. I have already got the AVPacket of ffmpeg with avcodec_encode_video2 AVPacket pkt_; ret = avcodec_encode_video2(c_, &pkt_, picture_,…
MichaelGD
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Mpeg1, vp9, theora and h264 intra lossless encoding strange results

I tried lossless intra coding of a few sequences including this one from xiph.org: https://media.xiph.org/video/derf/y4m/foreman_qcif.y4m and strangely mpeg1video wins by a great margin sizewise. I used FFmpeg with these settings: ffmpeg -i…
Anton B
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What fourcc should I use when encoding mp4 videos with VP9?

My goal is to write an mp4 video using the cv2 Python library, which itself depends on ffmpeg. What code should I use as the fourcc parameter, i.e.,: fourcc = cv2.VideoWriter_fourcc(*'????')
Jamie
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vpx_codec_decode return true but vpx_codec_get_frame return no frame

I want to make a player that can run webm(vp8/vp9) files. I make the player so that every time it finds a cluster send the cluster to the decoder and put all frames into memory. Something strange happens, if I call the same cluster more times the…
Silviu Petrut
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How to get the VP9 decoder from a C++ program on Hololens 2?

I am implementing a VP9 hardware decoder that will run on PC and Hololens 2. When I try to load the "MSVP9DEC.dll", it works well on PC but the DLL is not found on Hololens. I have installed the VP9 Video Extensions on the device. Here the snipped…
Cloyz
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How to set-up WebRTC with VP9 codec and lossless compression

I have been trying to figure out whether or not it is possible to set up WebRTC with VP9 codec and lossless compression. So far, I have been able to figure out, how to set VP9 in the SDP and also how to set the coding profile (0-3). However, my…
Alessandro
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ffmpeg DASH encoding: always getting bitrate as 200k for vp9 codec

I am using following command, earlier put here: to generate DASH files: ffmpeg -y -nostdin -loglevel error -i "$1" \ -map 0:v:0 -map 0:v:0 -map 0:v:0 -map 0:v:0 -map 0:v:0 -map 0:v:0 -map 0:a\?:0 \ -maxrate:v:0 350k -bufsize:v:0…
Saurabh
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FFMPEG converting HEVC to VP9 large file size

I'm trying to convert HEVC videos to VP9 so they can be played in a web browser while keeping file size roughly the same. I am struggling to create a video with similar quality/file size. Here's the stream info for one of the HEVC videos the video…
Tom B
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ffmpeg codec conversion; can't configure encoder

I am simply trying to convert a vp9 webm I have into a vp8 webm. this is the command I'm using. ffmpeg -i in.webm -c:v vp8 out.webm the vp8 encoder returns a strange error Input #0, matroska,webm, from 'in.webm': Metadata: encoder :…
PerfectChaos7
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ffmpeg vp9 not setting constant quality

I'm running ffmpeg to convert a 4k hevc video to vp9 but no matter what setting I use, it always comes out horrible quality and the same filesize. Command: ffmpeg -y -i /tmp/longsample.mkv -threads 6 -c:a libopus -c:v libvpx-vp9 -crf 30…
cclloyd
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Encoding Webm video with VP9 codec with ffmpeg

I am trying to encode a Webm video for embedding in HTML5 tag. According to information from Wikipedia and other places, Chrome and Firefox should support Webm with both VP9 and VP9 codecs. When I encode the vide with the VP8 codec, the video plays…
Michau
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Unusual results extracting VP9 pkt_size with ffprobe as compared to H.264

I'm trying to graph the bitrate over time for H.264 and VP9 videos by extracting the frame size with ffprobe, but many of the VP9 videos are showing significantly lower bitrate and total size than both the file size would indicate and that ffprobe…
Jeff S.
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