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• ffplay, rtsp and tcp transport protocol

  27 juillet 2022, par Denis Gottardello

  I have a problem on connect to a rtsp camera using ffplay.
The camera is under a router that permits only the TCP protocol.
I can watch the camera using ffplay only if I am in the same network of the camera.
So, when I am out, using this command line

  


  ffplay rtsp://address:554/onvif1


  


  or this

  


  ffplay -rtsp_transport tcp rtsp://address:554/onvif1


  


  I cannot watch the camera.
This is the output of ffplay (the latest).

  


  [rtsp @ 059ee680] Nonmatching transport in server reply  0B f=0/0
rtsp://address:554:/onvif1: Invalid data found when processing input


  


  Trying with VLC and I can watch the camera without any problem, both when I am in the same network or when I am out. The VLC output says that VLC uses TCP.
Has someone got a suggestion ?

  


• FFmpeg metadata tags for YouTube 3D side-by-side movies

  17 février 2021, par Some1Else

  YouTube requires specific metadata tags for 3D Side-By-Side format movies. If the tag is not there then YouTube does not give the anaglyph playback options for the end user.

  



  Their "help" is here
https://support.google.com/youtube/answer/7278886?hl=en-GB

  



  I am trying to get FFmpeg to add the MP4 tag when building my movie.

  



  Code that works now for a series of PNG files into a MP4.

  



  "ffmpeg.exe" -framerate 60 -i "VID%05d.PNG" -c:v libx264 -preset:v veryslow -profile:v high -crf 15 -s 1280x720 -pix_fmt yuvj420p -an -y "OUTPUT.MP4"


  



  But when I add the tag from the YouTube help page

  



  "ffmpeg.exe" -framerate 60 -i "VID%05d.PNG" -c:v libx264 -preset:v veryslow -profile:v high -crf 15 -s 1280x720 -pix_fmt yuvj420p -an -y -x264opts "frame-packing=3:frame-packing-interpret=1:frame-packing-quincunx=0:frame-packing-grid=0,0,0,0" "OUTPUT.MP4"


  



  I get this error from FFmpeg

  



  [libx264 @ 0000000002a8c3a0] bad option 'frame-packing-interpret': '1'


  



  This page (ignore the proselytising)

  



  http://www.pantherdynamics.yolasite.com/panther-dynamics-blog/uploading-3dsbs-content-to-youtube

  



  says you only need to use this tag

  



  -x264opts frame-packing=3


  



  Using that does make FFmpeg finish correctly, but the SBS is still ignored by YouTube

  



  The YouTube engineer blog post here

  



  https://youtube-eng.googleblog.com/2011/09/getting-3d-content-on-youtube_8.html

  



  links to an older supposed 3D movie that also does not give 3D options any more.

  



  https://www.youtube.com/watch?v=ubRHSg5daMs

  



  So maybe even YouTube's own 3D movies are crippled ?

  



  What am I doing wrong ? Any FFmpeg gurus able to help ?

  


• Extract closed captions VTT from stream using ffmpeg

  15 avril 2021, par EK0

  I can extract closed caption information from an mp4 file using ffmpeg v. 3.4.7 thus :

  


  ffmpeg -f lavfi -i movie="sample.mp4[out+subcc]" -map 0:1 -c:s webvtt /tmp/output.vtt


  


  The file was obtained by capturing a live HLS stream containing closed captions. I would like to extract the closed captions directly from the stream, instead after storing the video in a file. I've tried various things, including :

  


  ffmpeg -f lavfi -i movie="http://example.com/stream.m3u8[out+subcc]" -map 0:0 -c:s webvtt /tmp/output.vtt


  


  But the movie filter does not recognize the URL, even though the ffmpeg filter documentation says that the file name for the movie filter is "not necessarily a file ; it can also be a device or a stream accessed through some protocol" :

  


  


  [Parsed_movie_0 @ 0x264ad80] Failed to avformat_open_input 'http'
  
[lavfi @ 0x2647e80] Error initializing filter 'movie' with args 'http://example.com/stream.m3u8' ;
  
movie=http://example.com/stream.m3u8[out+subcc] : No such file or directory

  


  


  When I capture the video form the stream like this :

  


  ffmpeg -i http://example.com/stream.m3u8 /tmp/output.mp4


  


  ffmpeg reports that the stream does contain closed captions (which is where the captured video file sample.mp4 got them) :

  


  


  Stream #0:0 : Video : h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709), 480x270 [SAR 1:1 DAR 16:9], Closed Captions, 14.99 fps, 14.99 tbr, 90k tbn, 29.97 tbc

  


  


  Is it possible to do this ? Thanks for any pointers.