Recherche avancée

Sur d’autres sites (3500)

• Ffmpeg - avio_open returns AVERROR -13

  10 septembre 2021, par Tolga

  In my project, I am trying to save mp4 video from frames. I am demuxing video first and then decode and save the .mp4 file beside frames. However, this mp4 file is only playable from command line with ffplay. I am trying to play it from media player. After little bit search I found that, I need to remux it to mp4 file after encoding. The examples that I reference for my project are official ffmpeg example and leandromoreira's code. However, avio_open() parts returns -13 as error. I printed out with av_make_error_string(error, sizeof(error), response) and got Permission denied. When I look for that error in the error.h
there is no such an error defined.

  


• Intermitent Connection Issues for FFMPEG Stream capture

  22 novembre 2014, par Quentin Spottiswoode

  I intend to create a Python shell script to open a connection to an MP3 stream and record the stream over a specified period and save the file to a .mp3 file for distribution. ffmpeg will likely be involved through a shell command, rather than using any kind of python wrapper class.

  Occasionally, the source of the stream may encounter connection issues with the internet, resulting in the listening client (ffmpeg) losing it’s connection with the host. Currently ffmpeg discards the recording entirely and forgets about attempting to reconnect to the host.

  having had a look through ffmpeg’s extensive documentation, I found myself very confused...

  • Is there some method to retain the recording up to the point of the connection failure ?
  • Is there a method of automatically re-connecting to the stream when the host reappears, or do I have to catch the error and try a certain number of times ?
  • Is there a method of passing the error to the python script in order to create a suitable response ?

  Many thanks for your insight :)

• How to make ffserver which can make a snapshots ?

  4 mai 2016, par Serge Roussak

  I need some solution to take a "good" (not corrupted) snapshots from a camera device.

  Now I try to do this using the ffserver. Here is my config :

  HTTPPort 8090
  
  HTTPBindAddress 0.0.0.0
  
  MaxHTTPConnections 20
  
  MaxClients 10
  
  MaxBandwidth 10000
  
  
  
  <feed>
  
    File /tmp/feed.ffm
  
    FileMaxSize 200k
  
  
  
    ACL allow 127.0.0.1
  
  </feed>
  
  
  
  <stream>
  
    Feed feed.ffm
  
    Format jpeg
  
  
  
    VideoSize 800x600
  
    VideoFrameRate 30
  
    Preroll 5
  
    Strict -1
  
  
  
    NoAudio
  
    NoDefaults
  
  </stream>

  I run ffmpeg as follows :

  ffmpeg -f video4linux2 -i /dev/video0 -qmax 2 http://localhost:8090/feed.ffm

  and it works (almost) as expected except that sometimes getting a jpeg hangs. I.e. a browser sends the GET request and... alles (de). If I in this case stop the ffmpeg then the browser reports an error, but if don’t touch anything the browser may wait a response very long time. In any case this behaviour is not acceptable for me : it could be better if the ffserver answers with any kind of error or something about this.