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Questions tagged [vp9]

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14
votes
3answers
11k views

H.264 or VP9 for encoding for YouTube?

I make short films which I distribute through YouTube. I know YouTube uses VP9 for streaming, but YouTube still recommends uploading with h.264. It makes more sense to me to upload in as similar a ...
2
votes
2answers
2k views

Is it possible to encode MP4 video with VP9 codec?

Does MP4 support VP9 codec or is it exclusive to WebM?
2
votes
0answers
6k views

Convert mp4 to webm without quality loss with ffmpeg

What is the best way to convert a mp4 file to webm without quality loss (using vp8 or vp9) with ffmpeg? If I do ffmpeg -i in.mp4 out.webm the quality is very bad. I can specify a target bitrate via -...
2
votes
0answers
73 views

Video codec for progressive enhancement

JPEG has a progressive enhancement mode where a full frame can be downloaded quickly at low quality, and then the quality enhanced as the file is continually loaded. (Example image from http://...
1
vote
1answer
1k views

Create Alpha channel-Videos (obs stinger compatible) with ffmpeg and 2 files

I have 2 video files. One file is the main content and the other file has an alpha channel emulated with black and white (white = opacity 100 and black = opacity 0). Sometimes the emulated alpha ...
1
vote
1answer
672 views

Is it safe to use the yuva420 pix_format option with ffmpeg to encode webm videos?

I am encoding png image sequences to both webm and mp4 formats using ffmpeg. My goal is to achieve perceptually lossless videos, with the smallest file size I can reasonably achieve. The webm videos ...
1
vote
1answer
17 views

Encoding: Insert keyframes at certain positions

I am trying to improve the perceived quality of certain predefined frames (like the frames 45, 99, 154, ...). Reason is, that the video is interactive and pauses at these keyframes until the user ...
1
vote
0answers
69 views

Chrome renders WebM Video “darker” than other browsers / media players

Not sure if this is the correct community, but I have a question about video encoding and decoding. I have a video that gets served in MP4 or WebM formats, depending on browser support. I noticed ...
0
votes
1answer
244 views

What are the WebM (VP9+opus) encoding settings compatible for YouTube import for a video with a still image?

What are the WebM (VP9+opus) encoding settings compatible for YouTube import for a video with a still image ? I tried PAL and NTSC framerates with 48kHz stereo and and image size of 640x360 and kept ...
0
votes
1answer
147 views

Fast VP9 still image encoding

I use this command to create "myFile.webm", a VP9 video with one still image : $ ffmpeg -i myOriginialPureAudioFile.opus -loop 1 -i myAudioFile_640x360.png -shortest -threads 4 -speed max -c:a copy ...
0
votes
2answers
340 views

Is it possible to use 2-pass encoding to create vp9 / webm videos from an image sequence?

I'm currently creating webm videos using ffmpeg to encode an image sequence. My command is: ffmpeg -framerate 30 -f image2 -i frames/%04d.png -i my_audio.flac -c:v libvpx-vp9 -pix_fmt yuva420p -b:v 0 -...