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• FFMPEG - the video is out of sync with the audio

  5 août 2020, par mitsuki

  I tried to covert ISO file to m3u8, but the video is out of sync with the audio.

  


  I guess this is one of the reason.
First VOB file has only audio.
From second VOB file, there are audio and video.
When I play the m3u8, audio from first VOB and video from second VOB will start.
That's why probably the video is out of sync with audio.

  


  How do I skip First VOB file which has only audio.

  


  By the way, I am using this script.
I am looking forward to your advice.

  


  docker run —rm -it
  
-v $(pwd)/input :/config
  
jrottenberg/ffmpeg
  
-hide_banner
  
-y -i /config/input545.iso
  
-vf scale=w=640:h=360:force_original_aspect_ratio=decrease
  
-c:a aac
  
-ar 48000
  
-c:v h264
  
-profile:v main
  
-crf 20
  
-sc_threshold 0
  
-g 48 -keyint_min 48
  
-hls_time 6
  
-hls_playlist_type vod
  
-b:v 800k
  
-maxrate 856k
  
-bufsize 1200k
  
-b:a 96k
  
-max_muxing_queue_size 5000
  
-analyzeduration 60M
  
-probesize 60M
  
-max_interleave_delta 0
  
-hls_segment_filename /config/360p_%03d.ts /config/360p.m3u8

  


  Thank you.

  


• 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 ?