Questions tagged [vp9]

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VP9 codec compresses 100x better than AVC?

My GoPro Hero Session camera created the file GOPR0194.MP4, which is a 12-minute video. The file size is 2,257,011,431 bytes. Then I typed the command ffmpeg -i GOPR0194.MP4 GOPR0194.webm which ...
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0answers
525 views

ffmpeg vp9 encoding settings to produce “yuv420p(tv, progressive)”

I have a webm video that was made (from an h264) using AWS Elastic Transcoder, using the "System preset: Webm VP9 720p" preset. For this file, ffprobe gives: $ ffprobe converted-mp4.webm <snip&...
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1answer
448 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 ...
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0answers
277 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
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1answer
481 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 ...
1
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1answer
455 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
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2answers
1k 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 -...
2
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1answer
3k 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 ...
2
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1answer
3k 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 ...
2
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2answers
4k views

Is it possible to encode MP4 video with VP9 codec?

Does MP4 support VP9 codec or is it exclusive to WebM?
17
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2answers
19k 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
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0answers
171 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://...
15
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3answers
14k 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 ...