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• Capture raw video byte stream for real time transcoding

  9 septembre 2012, par user1145905

  I would like to achieve the following :

  Set up a proxy server to handle video requests by clients (for now, say all video requests from any Android video client) from a remote video server like YouTube, Vimeo, etc. I don't have access to the video files being requested, hence the need for a proxy server. I have settled for Squid. This proxy should process the video signal/stream being passed from the remote server before relaying it back to the requesting client.

  To achieve the above, I would either

  1. Need to figure out the precise location (URL) of the video resource being requested, download it really fast, and modify it as I want before HTTP streaming it back to the client as the transcoding continues (simultaneously, with some latency)

  2. Access the raw byte stream, pipe it into a transcoder (I'm thinking ffmpeg) and proceed with the streaming to client (also with some expected latency).

  Option #2 seems tricky to do but lends more flexibility to the kind of transcoding I would like to perform. I would have to actually handle raw data/packets, but I don't know if ffmpeg takes such input.

  In short, I'm looking for a solution to implement real-time transcoding of videos that I do not have direct access to from my proxy. Any suggestions on the tools or approaches I could use ? I have also read about Gstreamer (but could not tell if it's applicable to my situation), and MPlayer/MEncoder.

  And finally, a rather specific question : Are there any tools out there that, given a YouTube video URL, can download the byte stream for further processing ? That is, something similar to the Chrome YouTube downloader but one that can be integrated with a server-side script ?

  Thanks for any pointers/suggestions !

• How to get real video duration in php with ffmpeg [closed]

  24 avril 2013, par user82098

  ffmpeg -i *filename* tries to get info from video headers, but *filename* can be corrupted and then headers data will be incorrect
  for example ffmpeg -i *filename* can return me smth like "Duration : 00:20:21.09"
  but after converting *filename* I get video w duration 00:05:13

• Streaming video segments uploaded in real time

  3 avril 2013, par HaneTV

  I have an application that send quicktime video segments (5s) to a nodejs server that convert them into mpeg-ts in order to stream them to a wowza server in real time :

  ffmpeg -i tempPath -c copy -bsf:v h264_mp4toannexb -f mpegts uploadDir/file.ts

  I want to know if there is a way to stream those segments in real time as they come on my nodejs server to a wowza server without interruption (assuming I can get the segments in time).
  I tried an Http live streaming style by making a playlist like this (updated when segments are uploaded)

  #EXTM3U
  
  #EXT-X-PLAYLIST-TYPE:EVENT
  
  #EXT-X-TARGETDURATION:5
  
  #EXT-X-VERSION:3
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXTINF:5,
  
  movie0.ts
  
  #EXTINF:5,
  
  movie1.ts
  
  #EXTINF:5,
  
  movie2.ts

  And calling ffmpeg to send it to wowza :

  ffmpeg -re -i hls+file://mypath/uploadDir/playlist.m3u8 -c copy -f flv rtmp://127.0.0.1/live/stream

  but without any success : ffmpeg doesn't want to stream without #EXT-X-ENDLIST tag and removing the 'hls+' produces lots of errors st:0 PTS: 0 DTS: 0 < 4997 invalid, clipping

  Is there a way to accomplish that ?