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• How to encode bmp images to H264, H265 losslessly with and without Nvenc

  26 août 2020, par Hamza Ghizaoui

  So, let s assume that i have 5000 BMP images (1920x1080) that i want to encode into a video.

  


  I managed to do that losslessly using FFMPEG using the following 4 encoders :

  


  

  • libx264

  


  • libx265

  


  • h264_nvenc

  


  • hevc_nvenc

  


  


  The problem is that when i try to test my results using PSNR, i get extremly high values, in the 30-70 range. What is happening ?
Is the problem with color space conversion ? (None of the encoders above seem to support RGB, a conversion to YUV occur and I m assuming that a lot of averaging is happening. stuff that PSNR test is very sensetive toward).

  


  If my reasoning is correct, is it possible to encode BMP 100% losslessly. the resuling video will be streamed locally. the network is 10 GBS, so the size isn t that important.

  


  thank you

  


• FFMPEG - Delete unused files or streaming without saving files

  8 septembre 2020, par M.Demiral

  I need to get live video from a device. I have to play the video on the browser. live video can be received as RTP or UDP.

  


  Since there is no support for VLC, I published the video by getting it via RTP with FFMPEG and creating a web server with Nginx. But later I realized that it is recording video tracks to disk. This is a situation I don't want.

  


  I can show it in web browser using HLS.js. It is saving to HDD when I use the following command.

  


  ffmpeg -i udp://127.0.0.1:5000 -vcodec libx264 -vprofile baseline -acodec aac -strict -2 -max_muxing_queue_size 1024 -f flv rtmp://127.0.0.1/show/stream


  


  I don't want it to save to HDD.

  


  When the codec I understand is changed, it saves the video to HDD.
I think I prevented it from recording like this. But I don't know how to play from the web browser.

  


  ffmpeg -i udp://127.0.0.1:5000 -strict -2 -max_muxing_queue_size 1024 -f flv rtmp://127.0.0.1/show/stream


  


  Is there any way to delete unused files or stream without saving to disk ?

  


  P.S.

  


  First question as it may be needed : How to play a live video in the browser ?

  


• ffmpeg rtmp broadcast on youtube speed below 1x

  23 septembre 2020, par usr6969

  i made an python and opencv program that produce frame per second around 8-15fps with MJPEG output format where MJPEG address served on localhost webserver (0.0.0.0:5000) and, i do attempt to broadcast its frame to rtmp server like youtube using ffmpeg so basically i do convert MJEG to flv and forward to rtmp server with following command ffmpeg -f  mjpeg -i http://0.0.0.0:5000/video_feed -f lavfi -i anullsrc -c:v libx264 -vf "scale=trunc(oh*a/2)*2:320,unsharp=lx=3:ly=3:la=1.0" -crf 24 -c:a aac -ac 1 -f flv rtmp://a.rtmp.youtube.com/live2/xxx-xxx-xxx but unfortunatelly youtube stream has too many buffering that occur every around 5 second and ffmpeg terminal tell that writing speed is only around 0.317x (expected to be sync with youtube around 0.99-1x), my question is

  


  does there a way to stream 'realtime' around 8-15fps and automatically sync with youtube rtmp server without buffering because i thought that youtube require around 30fps while my fps only 9-15fps that probably causing buffer.
do there an such like additional ffmpeg's parameter that able to speed up writing ? thank you