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• What transcoding services can people recommend ? [closed]

  3 mai 2013, par Adrian Lynch

  A client of mine needs to accept a bunch of different video files and convert them to FLV. My experience with FFMEG on a previous project has highlighted that there will be some troublesome files.

  Depending on the price my client will pay for a professional service.

  What are people using and how are you finding the service ?

  Thanks.

• Youtube livestream stops receiving video from time to time (ffmpeg)

  15 décembre 2020, par wht_5005

  I have ip cam, raspberry pi (Ubuntu 18.04.4 LTS (GNU/Linux 5.3.0-1036-raspi2 armv7l)) with ffmpeg (3.4.8-0ubuntu0.2) on board and I am trying to do 24/7 youtube livestream.
I have set up a service that start ffmpeg on boot. It receives rtsp stream from camera and sends it to youtube. Here is the ffmpeg setup :

  


  ffmpeg -thread_queue_size 512 -rtsp_transport tcp -i rtsp://cam_address -c:v copy -af "aresample=async=1:first_pts=0" -c:a aac -ac 2 -ar 44100 -fflags +genpts -f flv rtmp://youtube_address -nostdin -nostats


  


  I have noticed that ffmpeg may accidentally stop working from time to time (rather rarely but still) so the service should restart if ffmpeg crashes. Additionally just in case I have set up a cron job that restarts the service every hour, so if it stops working for some reason and that magic that should bring it up fails it should still get up within an hour.

  


  What bothers me, sometimes it stops working but in an unusual way. The service on raspberry pi is running, ffmpeg is running as well, nethogs shows that ffmpeg is both receiving and sending proper amount of data. Stream status on youtube is all right as if everything was just fine but there is no video there (it looks as if it was still loading/buffering but it is not). Restarting the service does not make it work. However if I stop the service, wait a few seconds and start it again the youtube stream starts working as it is supposed to.

  


  Why such things happen and how can I fix it ?

  


• FFmpeg.AutoGen for converting MP3 already in memory to Wav

  17 décembre 2019, par Jie

  We are implementing a Web service, and the goal is to convert short (a few seconds) mp3 audios to WAV on the fly. The input mp3 content is a binary payload to the service. The speed of our web service is critical, so, saving and reading mp3 and wav from files (even with memory disk) are not an option.

  It seems that all the functions provided in ffmpeg.autogen require either the filepath or url. Any suggestions that we could do the conversion for the mp3 content, which is already in memory ?

  BTW, we are aware of this post : How to convert wav file to mp3 in memory ?, which uses NAudio, but we would like to try ffmpeg, for comparing the speed and some other purposes. Many thanks indeed.