Recherche avancée

Sur d’autres sites (6096)

• Separating webserver and processing server

  6 mars 2020, par John Doe

  I would like an architecture design advice.

  I have a projet composed of a public Node.JS API server (handling client HTTP browser requests)

  The purpose of my project is to convert an image to a video (I do this using ffmpeg as CLI and it can take some time)

  The business workflow should be the the following :

  1) A user sends an image URL and his email (as POST parameters) to the API

  2) The API should responds "OK 200" and send later an email containing a video of the image

  Here is my idea (and what my current program does) :

  1) The nodeJS API directly responds "OK 200" to the client

  2) The nodeJS server asynchronously downloads the image using npm axios library, then saves that image to current directory, then asynchronously launchs a heavy tool that convert
  the image to a video (can take some time), then sends an email to the client.

  In my design everything occurs on the same server (NodeJS API).
  I think this isn’t a good design at all and I should separate the Nodejs HTTP API and the heavy tasks video processing server.
  However, this separation means communicating image from a server to another one and i don’t know how to do that.

  I think there are useful services that I could use on AWS but I don’t know which one and how.

  Would it be possible to help me in the design of this application (and which cloud services could I use ?)

• Decoding H.264 UDP stream

  24 février 2019, par user2422659

  I have to work with ’FFMPEG’ in order to decode ’UDP’ streaming(Not ’RTP’ or ’RTSP’) of raw ’h264’ video.address.
  So far i have compiled and make ’ffplay’ decode successfully a local ’h264’ file.
  Now i have to add support of that ’UDP’ listener who will get chunks of data.
  As far as i understand ’AVFormatContext.fileName’ gets a file name or ’RTSP’
  Any help ?
  what is the proper way to do this ?

  Thanks in advanced.

• Create drawbox with ffmpeg between specific seconds (without reencoding whole video - faster)

  31 mars 2022, par protter

  My plan was to put a transparent red box behind a video. This box should only be present from second 1-45.
But if the videos are 3 hours long, the process takes a long time although it only has to process 45 seconds.

  


  My first attempt takes too long :

  


  ffmpeg -i %1 -vf drawbox=0:9*ih/10:iw:ih/10:t=fill:color=red@0.5:enable='between(t,1,45)' "%~dp0transpred\%~n1%~x1

  


  Then i tried splitting the video into two parts. put the box on the first video, and then put the two back together again.

  


  ffmpeg  -ss 00:00:00.0000 -i %1 -to 00:00:45.0000  -vf drawbox=0:9*ih/10:iw:ih/10:t=fill:color=red@0.5:enable='between(t,1,45)' "%~dp0transpred\%~n1A%~x1"

  


  FFMpeg -ss 00:00:45.0000 -i %1 -c:v copy -c:a copy -avoid_negative_ts make_zero "%~dp0transpred\%~n1B%~x1"

  


  But i don't even have to try to put these two together, because they are not separated exactly at the second. I have read that this is due to "timestamps" and the different video and audio streams.

  


  Now I'm trying an approach to create a stream with the bar, and then overlay it with the finished video. I haven't quite managed that yet, and I don't know if it's faster.
Shortening the video is very fast.

  


  EDIT (Added as a replacement for the comment later)

  


  Thanks for your help I have almost done it with a slightly different approach. Unfortunately, the second part now always has no sound. No matter if I put A and B (B no sound) or B and A (A no sound) together.

  


  

  1. First split with mkvmerge so i have no worrys about the keyframes and get the exact time
mkvmerge --split timestamps:00:00:45.100 A.MKV -o splitmkm.mkv

  


  2. Then add the Bar (Black because of easier testing) :
ffmpeg -i splitmkm-001.mkv -vf drawbox=0:9*ih/10:iw:ih/10:t=fill BAR1.MKV

  


  3. Merge (mkvmerge ends with error) :
ffmpeg -safe 0 -f concat -i list.txt -c copy output1.mkv

  


  


  EDIT (Answer to kesh)

  


  This was the error Again, audio codec config's must match across all your concat files. The drawbox changed the audio Codec from AC-3 to Vorbis.

  


  the procedure is now :

  


  

  1. mkvtoolnix\mkvmerge --split timestamps:00:00:05.100  %1 -o A_splitmkm.mkv with mkvmerge i have an exact split at the time, and i don't have to learn about keyframes.

  


  2. ffmpeg -i A_splitmkm-001.mkv -vf drawbox=0:9*ih/10:iw:ih/10:t=fill:color=red A_BARmkm.MKV create the Bar

  


  3. ffmpeg -i A_BARmkm.MKV -i A_splitmkm-001.mkv -map 0:v  -map 1 -map -1:v  -c copy A_BARwithAudio.mkv redo the step with the changed audio from drawbox

  


  4. ffmpeg -safe 0 -f concat -i list.txt -map 0  -c copy A_output1.mkv merge

  


  


  Now everything works.
Thanks alot !