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• FFMPEG - Download video in parts and concat, stutter at concat points

  23 juillet 2022, par rnbwSmn

  My goal is to download a video (or M3U8) in parts/chunks which I can later concat.

  


  For context, I would like to download videos in an Android Service which may be stopped at any time, so I think chunking is the right approach.

  


  After some time I got the "downloading the parts" right, using this. I would later put that in a function, and for now I chose the chunks to be 30 seconds long.

  


  %offset% = 30 * %part%

ffmpeg -ss %offset% -t 30 -i INPUT_FILE -avoid_negative_ts 1 out%part%.mp4


  


  The first line is just pseudocode, part is starting at 0.
This works fine, downloading 30 second long .mp4 files.

  


  After that I tried merging them together into a single .mp4. For the tests I only downloaded the first few parts.

  


  Concat command :

  


  ffmpeg -safe 0 -f concat -i concat.txt -c copy final.mp4


  


  This would be a very short concat.txt file :

  


  file 'out0.mp4'
file 'out1.mp4'


  


  The concat works but has one problem : At the point where both files are actually combined, so at 30 seconds, there is a small stutter in video and audio.

  


  So what I think is going on is that I download parts that are 30s long, starting at multiples of 30s so there is a small overlap ? In the "Details" part of the Windows file properties it also shows a length of 31 seconds, so the video is even longer than I want.

  


  I tried setting the duration of each part in the concat.txt, both to 30s and to 30s - 1 frame

  


  23.98 fps -> 1/23.98 spf = 0.0417s


  


  But with a duration of 30 as well as 29.9583, although it is better, there is still a small stutter.

  


  file 'out0.mp4'
duration 29.9583
file 'out1.mp4'
duration 29.9583


  


  I also tried with a different fileformat, .ts files, but the stutter was still there. I still think my timings are not quite right, but at this point I don't know where the problem is exactly. What do I need to change to remove the small stutter ?

  


• Setup FFMpegCore in Visual Studio 2019

  27 juillet 2022, par DsiakMondala

  I am confused on the basics of using a library. I understand that there is a library called FFMpeg and a wrapper called FFMpegCore so we can use FFMpeg with C#, correct ? I downloaded both FFMpeg and FFMpegCore and I have them in my project's folder. Although I didn't perceive any class named FFMpegOptions in either of the file's folders.
I am stuck on how to actually set it up so I can use it in my little project, I never downloaded someone's library before. Can somebody please walk me though the motions of connecting the three of them together ?

  


  So far I experimented with :

  


  

  • Add a reference to my project, but there doesn't seem to be any .dll, .tlb, .olb, .ocx or .exe files to add

  


  • Add an existing project to my solution. There is a project called FFMpegCore.csproj but adding it raises a missing SDK error. Weirdly enough, opening the same project as a standalone doesn't raise any issues which makes me thing the operation I am trying is inadequate.

  


  


  I am sure this is a silly and easy setup to perform but I just don't know enough to find a solution.

  


• How Can i Download this video ? Encrypted m3u8 ?

  16 septembre 2022, par אורן NO

  Hello everyone For almost a whole month now I have been trying to download a file from a specific site

  


  This is the link to the video
https://www.karaoke.co.il/api_play.php?type=clip&id=58370&autoplay=undefined&referer=karaoketv

  


  The M3u8 files are split into 2 parts.

  


  Video file
https://www.video-cdn.com/video/encrypt/750802ea0bc2d02fac93adeaa1398ec2/750802ea0bc2d...2-57d9518fae69

  


  And an audio file
https://www.video-cdn.com/video/encrypt/750802ea0bc2d02fac93adeaa1398ec2/750802ea0bc2d...2-57d9518fae69

  


  As far as I know there is a Key that needs to be entered in order to download the file.

  


  And when I run the command in ffmpeg

  


  I encounter many errors like :
Unable to open key file

  


  Anyone who can download it.
I would be very happy if he would write me a code that works and explain to me how to do it

  


  These are all the codes I have already tried

  


  ffmpeg -decryption_key https://www.video-cdn.com/video/key/750802ea0bc2d02fac93adeaa13cde64 -i https://www.video-cdn.com/video/encrypt/750802ea0bc2d02fac93adeaa1398ec2/750802ea0bc2d02fac93adeaa1398ec2/video_720p.m3u8?token=R915dD-72351a7c-3dd1-4e58-b6c2-9cc813eeb183 -vcodec libx264 {output_file}


  


  ffmpeg -decryption_key key -i file -max_muxing_queue_size 9999 d.mp4

  


  ffmpeg -allowed_extensions ALL -protocol_whitelist data, file, http, https, tcp, tls, crypto -i "https://www.video-cdn.com/video/encrypt/f242d2da41d03b3955fb866efc5dbd59/f242d2da41d03b3955fb866efc5dbd59/video_720p.m3u8?token=R915dD-a1430cfc-0bda-46a0-a7e9-b15308875dc7" c copy -bsf : a aac_adtstoasc test.mp4 -decryption_key C :\ ffmpeg\enc.key

  


  hlsdl -K "1a9625fb34a4afe0d5446138e9543563" https://www.video-cdn.com/video/encrypt/f242d2da41d03b3955fb866efc5dbd59/f242d2da41d03b3955fb866efc5dbd59/video_720p.m3u8?token=R915dD-be07b7e6-08aa-441b-afbd-5c7876409878

  


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