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• Using FFMPEG to stream from one computer to another on the same network

  23 juin 2021, par Andy B

  My problem

  


  I have a device with cameras, and I can access the video from those cameras via RTP over RTSP.

  


  I have an Ethernet cord going from the device to my computer, and I can see/record the video from the device using FFMPEG or VLC. I just use rtsp://<ip of="of" device="device">/path/of/stuff.extension?camera=<number></number></ip> like the user's manual says.

  


  This works great, but ultimately, I want to stream this video to another computer on the same network. I have tried many different things, but nothing seems to work.

  


  Theoretically, this FFMPEG command should work, but I'm messing up somewhere and I don't know why or where.

  


  ffmpeg -rtsp_transport tcp -i rtsp://<ip of="of" device="device">/path/thing.extension?camera=1 \ &#xA;-f mpegts udp://<ip of="of" computer="computer" i="i" want="want" to="to" send="send" it="it">:<some port="port">&#xA;</some></ip></ip>

  


  In VLC on the other computer, I want to be able to just go into VLC and start a network stream that looks like udp://@<ip address="address">:<port></port></ip>

  


  What I thought would work, but doesn't

  


  If the camera device has IP A.A.A.A, and the computer getting and streaming the video is B.B.B.B, and the computer I want to watch the streamed video on is C.C.C.C then is the following correct ? Because it does not work for me...

  


  Computer A :

  


  ffmpeg -rtsp_transport tcp -i rtsp://A.A.A.A/path.ext?camera=1 -f mpegts udp://B.B.B.B:10001


  


  Computer B (in VLC) : udp://@B.B.B.B:10001

  


• Multiple subtitle tracks on iOS with AVPlayer [closed]

  23 novembre 2024, par Martin Paucot

  I have a bunch of videos that are hosted on Vimeo. To allow users watching them on the mobile apps (Android & iOS) we use the m3u8 format given directly by Vimeo.

  


  It works great with expo-video as all our videos have transcript for different languages.

  


  I would like to allow the users to download videos so they can be watched offline. To achieve that I use ffmpeg to convert the .mp4 to .mkv and combine the .srt files.

  


  This solution works great on android, users can download videos and watch them offline with the ability to select subtitles. Unfortunately it seems that the AVPlayer on iOS (used by expo-video) does not support MKV. I tried different formats mov, mp4 containers, m4v where subtitles show properly on VLC after conversion but not on the iOS player. (either no subtitles at all, or only the first track).

  


  Is there a file format supported by AVPlayer that allows multiple subtitle tracks ?

  


• How to extract audio tracks from a stream using FFMPEG or other tools ?

  17 septembre 2023, par Vassili Bagrov

  Here is the stream link that I am trying to download.

  


  I can download the video, but for some reason it doesn't include the audio stream.

  


  The audio stream is also in .ts format and has 1569 chunks.

  


  When I downloaded all the audio files, I tried to convert them in single temp.ts file to them convert it into an mp3 file with this command :

  


  cat audio_7e42e066-9f6c-44f4-9ac8-10b50c3edfae_*.ts > temp.ts


  


  I tried to then convert it into an mp3 file with this command :

  


  ffmpeg -i temp.ts -acodec copy out.mp3


  


  But got an error :

  


  temp.ts: Invalid data found when processing input


  


  What are my options to download audio files ? There are actually 3 audio tracks if I watch the video from the website.
Please tell me there is a way to do it other than screen record the whole video.