video – Page 6 – Tarik Billa

Download content video from video stream with a path of .TS or .m3u8 file through actual code so i can make chrome extension [closed]

January 6, 2023 by Tarik

Easy youtube-dl example on macOS (in the command line Terminal; Windows supported too): # List variants (resolutions/bitrates) $ youtube-dl -F https://bitdash-a.akamaihd.net/content/MI201109210084_1/m3u8s/f08e80da-bf1d-4e3d-8899-f0f6155f6efa.m3u8 [generic] f08e80da-bf1d-4e3d-8899-f0f6155f6efa: Requesting header [generic] f08e80da-bf1d-4e3d-8899-f0f6155f6efa: Downloading m3u8 information [info] Available formats for f08e80da-bf1d-4e3d-8899-f0f6155f6efa: format code extension resolution note audio-English_stereo mp4 audio only [en] 628 mp4 320×180 628k , avc1.42c00d, video only 928 mp4 … Read more

Using ffmpeg to encode a high quality video [closed]

January 5, 2023 by Tarik

A couple of things: You need to set the video bitrate. I have never used minrate and maxrate so I don’t know how exactly they work, but by setting the bitrate using the -b switch, I am able to get high quality video. You need to come up with a bitrate that offers a good … Read more

TDD/BDD screencast/video resources [closed]

December 19, 2022 by Tarik

Brett Schuchert from Object Mentor just posted a series of videos on TDD The videos are meant to be watched in order. GettingStarted Adding Basic Operators Removing Duplication Extracting to Strategy Removing Duplication via Refactoring or Removing Duplication via Tdd using Mockito Introducing an Abstract Factory Adding a Sum operator Adding Prime Factors Operator Composing … Read more

Creating a video from a single image for a specific duration in ffmpeg

December 11, 2022 by Tarik

ffmpeg -loop 1 -i image.png -c:v libx264 -t 15 -pix_fmt yuv420p -vf scale=320:240 out.mp4 The -t 15 makes it 15 seconds long. The -vf scale=320:240 sets the width/height. Make sure to use the latest ffmpeg version e.g. http://johnvansickle.com/ffmpeg/

How can I extract a good quality JPEG image from a video file with ffmpeg?

November 20, 2022 by Tarik

Use -qscale:v to control quality Use -qscale:v (or the alias -q:v) as an output option. Normal range for JPEG is 2-31 with 31 being the worst quality. The scale is linear with double the qscale being roughly half the bitrate. Recommend trying values of 2-5. You can use a value of 1 but you must … Read more

Trying to understand CMTime and CMTimeMake

November 15, 2022 by Tarik

1) CMTimeMake(1,10) actually means a value of 1 and a timescale of 10. They are a numerator and denominator, so it is 1/10 of a second, not 1 second. 2) The result will be like CMTimeMake(2, 10), which is 2/10ths of a second.

Streaming via RTSP or RTP in HTML5

November 13, 2022 by Tarik

Technically ‘Yes’ (but not really…) HTML 5’s <video> tag is protocol agnostic—it does not care. You place the protocol in the src attribute as part of the URL. E.g.: <video src=”rtp://myserver.com/path/to/stream”> Your browser does not support the VIDEO tag and/or RTP streams. </video> or maybe <video src=”http://myserver.com:1935/path/to/stream/myPlaylist.m3u8″> Your browser does not support the VIDEO tag … Read more

Fetch frame count with ffmpeg

November 12, 2022 by Tarik

ffprobe ffprobe -v error -select_streams v:0 -count_packets \ -show_entries stream=nb_read_packets -of csv=p=0 input.mp4 This actually counts packets instead of frames but it is much faster. Result should be the same. If you want to verify by counting frames change -count_packets to -count_frames and nb_read_packets to nb_read_frames. What the ffprobe options mean -v error This hides … Read more

How to extract 1 screenshot for a video with ffmpeg at a given time?

October 25, 2022 by Tarik

Use the -ss option: ffmpeg -ss 01:23:45 -i input -frames:v 1 -q:v 2 output.jpg For JPEG output use -q:v to control output quality. Full range is a linear scale of 1-31 where a lower value results in a higher quality. 2-5 is a good range to try. The select filter provides an alternative method for … Read more

What are all codecs and formats supported by FFmpeg?

October 24, 2022 by Tarik

Codecs proper: ffmpeg -codecs Formats: ffmpeg -formats