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Questions tagged [vp9]

77 questions
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How to implement VP9 codec in a free open source Peer-to-peer communication app?

So there is this Application RetroShare which currently uses speex codec and libav codec for VOIP communications. They expect a new improved VoIP cross platform codec as the old one aren’t fitting the bill. What I’ve landed on is implementing VP9…
Rajat verma
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WebRtc Bandwidth / resolution / frame rate control

I want to know why I normally transmit a 320240 resolution video and default my uplink traffic is at 1.5MB； when I modify the SDP bandwidth limit, for example at 500kbps/s my video width and height are still 320240 and the frame rate is not…
GiantKs
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How does WebRTC determine when to resize a video based on adaptive bitrate?

Can someone help me understand how WebRTC determines when to adjust the size of a video steam based on bitrate? I'm looking for a slightly lower level description than what I can find with a basic Google search. Ideally, if there are any key files…
Friendly King
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Incomplete video file when converting GIF to WEBM using FFmpeg

Converting from Gif to WebM in Q mode outputs an incomplete video when targeting low CRF values. For example, running the command below produces a WebM video with a duration of 1.15 secs while the input Gif is 2.16 secs. ffmpeg.exe -i in.gif -c:v…
Eduardo Lemus
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Does latest chrome support vp9 svc on webrtc environment?

I read an article(october, 2018) about simulcast, svc and codec. Article says, Right now, SVC is not supported by the current codecs in a WebRTC environment. It is being supported by VP9 (the successor to VP8) and H265 (the successor to H264). When…
delbert park
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Is hardware encoding of VP8/VP9 on Android with error resilience possible?

I try to use the MediaCodec class to encode to VP8/VP9. Basically this works but transmitting the generated data using UDP results in many artifacts when decoding. This is because there is some packet loss. I know vpxenc has an option to enable…
strentler
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Gstreamer videoconvert color conversion wrong?

I'm launching a gst-launch-1.0 that captures camera images with nvgstcamera. The images are encoded to VP9 video. The video is tee'd to a filesink that saves the video in a webm container and to a VP9 decoder that pipes the images into an…
Laurenz
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Can ffmpeg extract the motion vectors from VP9 videos?

And if it can, are the motion vectors similar to how they are in H264? I ask because I can run a command like ffmpeg -y -loglevel error -flags2 +export_mvs -i "$1" -vf codecview=mv=pf+bf+bb /tmp/mot ion_vectors.mp4 then view it with VLC and…
John Allard
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Codec comparison compression/quality

So I'm rebuilding my video library from my file archives (I have my DVDs/Blurays already decoded on my disk) and I want to ensure that I have the best quality files and compression. I know that lossless is not practical for saving space but I do…
Techie Android
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VP9 WEBM video support in EDGE browser

I see that EDGE claims VP9 codec support in the latest versions by enabling the VP9 in MSE in their browser configuration. I tried doing that and still, it doesn't work and it throws an error saying this type of video file isn't supported. I had…
raghav dutt
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convert video/webm;codecs=vp9 to .flac

I have a file in the video/webm;codecs=vp9 format and would like to convert it to .flac audio format? Is this possible? Thanks
BC00
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ffmpeg is preferring to encode in VP9 but I'm trying to encode in VP8

I'm trying to encode webm video files specifically in VP8, but ffmpeg is forcing VP9. I'm using -c:v libvpx, which to my knowledge is supposed to be VP8, but when it encodes I see it's encoding in VP9 instead: ffmpeg -framerate 7 -loop 1 -i…
user1689634
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How to use ffmpeg to calculate the ssim value of compressed VP8/VP9 video?

I have a HEVC video. I converted it to VP8 and VP9 by using the FFmpeg commands below: ffmpeg -i ./hevc.mp4 -vcodec libvpx -crf 18 -b:v 0 -speed 1 ./vp8.webm ffmpeg -i ./hevc.mp4 -vcodec libvpx-vp9 -crf 18 -b:v 0 -speed 1 ./vp9.webm The conversion…
user3032481
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MediaRecorder recording remote stream using VP9 codec doesn't work

I tried to use MediaRecorder to record remote video stream using codec VP9, but I can only get a video that cannot play. Env: latest Chrome (105.0.5195.127). The stream is so common. stream = await navigator.mediaDevices.getDisplayMedia({ …
GStarP
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How to make ffmpeg re-encode an vp9 webm with alpha into a vp9 webm with alpha

I am trying to find optimal parameters for encoding a transparent video using ffmpeg in my scenario, and as a test, I have been re-encoding a pre-made transparent .webm (vp9 with alpha channel, made using python vidgear) like this: $ /usr/bin/ffmpeg…
LemmeTestThat
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