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• How to make low latency and have good quality for hls live streaming

  10 avril 2017, par parsa

  I used this code for create live stream from a mp4 file :

  ffmpeg -re -i input.mp4 
  
  -c:a aac -c:v libx264 -s uhd2160 -f hls -hls_list_size 0 2160p/out.m3u8  
  
  -c:a aac -c:v libx264 -s 2560x1440 -f hls -hls_list_size 0 1440p/out.m3u8  
  
  -c:a aac -c:v libx264 -s hd1080 -f hls -hls_list_size 0 1080p/out.m3u8  
  
  -c:a aac -c:v libx264 -s hd720 -f hls -hls_list_size 0 720p/out.m3u8  
  
  -c:a aac -c:v libx264 -s hd480 -f hls -hls_list_size 0 480p/out.m3u8  
  
  -c:a aac -c:v libx264 -s nhd  -f hls -hls_list_size 0 360p/out.m3u8 
  
  -c:a aac -c:v libx264 -s cga  -f hls -hls_list_size 0 200p/out.m3u8

  but in streaming time, there are very latency.
  it seems, this latency exists on streaming videos which have very heigh quality,just like the video(4k) which I used that for livestream.
  How can I decrease this delay and decrease memory usage for that ?

• Converting mp4 to multiple resolutions using FFMPEG

  12 avril 2017, par Edwin Flataunet

  I am developing a E-Learning website where people can upload videos.

  When someone uploads a video, they usually upload it in 1080p full HD which is good.
  Now the issue is that when people watch the videos, they are only in 1080p and some people have bad internet (including myself) so watching a video in 1080p is not optimal.

  So I assume that converting the video to different formats (720p, 360 etc..) is the best way to go here.
  So I tried using FFMpeg, and it works, but its really slow, especially since some videos are over 10 minutes long and over 1gb in size.

  I use this command in FFMPEG :

  ffmpeg -i video.mp4 -vf scale:1280:720 -strict -2 output.mp4

  This works, but its really slow.

  Is there any better way to do this ? Since some people upload 5-10 videos and every video has to be in 3 different formats (1080p(original) 720p, 360p).

  Can someone give me some guidelines how to tackle this issue, as this kind of stops the website from progressing atm.

  Thanks

• Combining Video and Audio of different length in bulk

  27 avril 2017, par user2981223

  I am going through a tv series right now and editing the files to be to my liking. I have one set which has the video I want and one set that has the audio. I have a batch file that I can run that takes the video from every file in folder "A" and the audio from every file in folder "B" and outputs it to a folder named "output." But with this particular series, that is only half of what I need done.

  At the end of every episode of the files in the "B" folder there are some extra things. What I would like to do is take the audio and video from "A" and the audio from "B", combine it all into one file and also take the "A" and "B" files, compare the time stamps, and add the extra video from "B" to the output file.

  Let me put it another way. Let’s say "A" is 1080p with Japanese audio and is 20 minutes long. Let’s say "B" is 720p with English audio and is 23 minutes long. I want the whole 1080p video with both audio tracks, plus the 720p video spliced onto the end. Both files start at the same spot so syncing isn’t an issue. The issue is that the difference in time is different for every episode. So some episodes are 3 minutes longer, some only 30 seconds. Is there a way to make ffmpeg or another tool look at the difference in times and just add the excess to the output file ?

  Sorry for being long winded. Thanks for any help and guidance.