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• How do websites render custom videos programatically ?

  18 juillet 2020, par Eric Smith

  I've noticed a number of websites such as https://biteable.com, https://animoto.com/apps/online-video-maker, etc. that are essentially online video editors that allow users to apply effects, add custom text, etc. and render a video as a result.

  


  I've done a bit of research but can't find any high-level answers on how these websites accomplish creating videos programmatically. I've seen mention of "FFmpeg", but this seems like it would only be able to accomplish basic tasks such as converting a series of images into a video (am I wrong ?).

  


  I know very little about video rendering and was hoping someone had an idea to get me started in my research. Are there libraries that exist that can aid to accomplish what these websites are doing ? Or are these websites starting from the ground up with lower-level languages to accomplish this ?

  


• Video stream url extract using python

  25 octobre 2016, par AGR

  I am trying to extract video source url from online video, I have tried selenium and scrapy but I can use these tools to extract any data from the website if we know the exact xpath.

  But some websites they don’t have source url on the page (hidden), I can see that on wireshark traffic or “Video DownloadHelper” chrome addon extracts the source.

  Is there any python lib to extract any streaming video url from online page (like Video downloadhelper) ?

  Thanks in advance.

• Live video feed from ffmpeg to html with minimum latency

  11 juin 2020, par XPModder

  I am currently working on a project that requires me to get live video from a raspberry pi camera and stream it to a html page. At the moment I am using ffmpeg to create *.m3u8 and *.ts files and stream the video that way. In the html page I have hls.js running that receives the video and displays it through a video tag. This does work pretty good, but the latenca is a problem... The video in the browser is always between a few seconds and multiple minutes late. This is not really acceptable.

  



  I am currently using the following command to run ffmpeg :

  



  ffmpeg -loglevel quiet -y -i - -c:v copy -preset veryfast -hls_wrap 2 -hls_time 1 -g 1 stream.m3u8

  



  I have also tried other values for -hls_time and -g including values between 0 and 1.

  



  I am now searching for an alternative solution, that does not have this problem, or a way to reduce the latency to at least 2 seconds max. The video itself is transferred in to ffmpeg as h264. The html webpage is hosted on the same raspberry pi using apache2.

  



  Is there a way to accomplish that without installing a seperate streaming server on the pi ?

  



  Also this all has to work without a internet connection. Meaning the pi and the smartphone/computer that is viewing the html page are on the same wifi, but that wifi does not always have a connection to the internet and does not need to have one.

  



  So basically I want to have h264 video into ffmpeg and then somehow into html tag. The stream should also be accessable in another way, as I have a button on the page that should start and stop the recording of the stream to an mp4 file. This recording is also done using ffmpeg at the moment.

  



  I am asking this here and not on the raspberry pi stackexchange forum, because it is a general problem and the problem itself does not have anythingto do with the raspberry pi.