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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 merge two .mp4 videos - resolution distorted

  9 juin 2016, par Misha Moryachok

  I am trying to merge two .mp4 videos, and in some cases the seconds video part is distorted in the output video. Providing an example below :
  https://www.youtube.com/watch?v=wWMNTBWJ37A

  The real video is : https://www.youtube.com/watch?v=ASio-j-Epi8

  As you can see, we added intro before the real content, however, the real content is stretched.
  In my opinion it happens because first video is 1280x720 and the second is 460x720.

  Providing commands for merging videos :

  *1st step (convert the videos from .mp4 to .ts)

   ffmpeg -i videoPathMP4 -c copy -bsf:v h264_mp4toannexb -f mpegts videoPathTS

  *2nd step (merge videos)

  ffmpeg -i "concat:$video1 | $video2" -c copy -bsf:a aac_adtstoasc $meagePathMP4

  Video output is like you saw in provided videolink on youtube.
  I also tried to change the first video resolution to be like the second video :

  ffmpeg -i inputVideo.mp4 -s 460x720 outputVideo.mp4

  However it doesn’t helped.
  Is anyone know how to solve this ?
  Thanks

• Calling one CLU(command line utility) with argument from another CLU in cmd ( youtube-dl from ffmpeg with additional arguments)

  3 septembre 2019, par beastboy

  I am able to run youtube-dl using command prompt , I have already kept youtube-dl.exe in the ffmpeg main folder and the ffmpeg bin folder and also I have kept ffmpeg.exe in the youtube_dl folder,

  now I am trying to call ffmpeg.exe in command prompt from youtube-dl with some additional arguments in ffmpeg and vice versa with the below commands
  and getting the following erros.

  Command

  C:\ffmpeg>youtube-dl -f 160 https://www.youtube.com/watch?v=u3APNJYMrLo --hls-prefer-ffmpeg --external-downloader ffmpeg --external-downloader-args -ss 00:00:20 -to 00:00:30

  Command

  C:\youtube_dl>youtube-dl -f 160 https://www.youtube.com/watch?v=u3APNJYMrLo --hls-prefer-ffmpeg --external-downloader ffmpeg --external-downloader-args -ss 00:00:20 -to 00:00:30

  Error

  Usage: youtube-dl [OPTIONS] URL [URL...]
  
  
  
  youtube-dl: error: using output template conflicts with using title, video ID or auto number

  and

  Command

  ffmpeg -ss 00:00:20 -to 00:00:30 -i "$(youtube-dl -f 160 -g https://www.youtube.com/watch?v=u3APNJYMrLo)" -c copy youtube.mp4

  Error

  $(youtube-dl: No such file or directory

  Command

  ffmpeg -ss 00:00:20 -to 00:00:30 -i $(youtube-dl -f 160 -g https://www.youtube.com/watch?v=u3APNJYMrLo) -c copy youtube.mp4

  Error

  $(youtube-dl -f 160 -g https://www.youtube.com/watch?v=u3APNJYMrLo): Invalid argument

  as per my understanding and the documentation pages of youtube-dl and ffmpeg the commands should work and should download the videos in the specified resolution but its not working.
  Can someone guide me on this , what is wrong with the code and how to rectify it if any.