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• ffmpeg - create a morph video between 2 images (png solid hex color) 0.55 seconds for a length of 10 seconds

  19 décembre 2022, par iceget

  currently i create with imagick (convert -size 640x480 xc :#FF000 hex1.png and hex2.png) 2 png images and save both png files.

  


  now i need the following (but i have no idea how i can do that (maybe ffmpeg ?)) :

  


  create a video 640x480 for example a length of 10 seconds like this method :
0.00s (hex1) > 0.55s (hex2) > 1.10s (hex1) > 1.65s (hex2) > 2.2s (hex1).... until the 10 seconds has reached.

  


  the hex1 and hex2 images should always morph/fade from hex1 => hex2 => hex1, ...

  


  but the time is very critical. the time must be exact always have 0.55.

  


  maybe i can create on same way direct the HEX colors without creating first a png image for that purposes.

  


  can anybody helps me how i can do that best way ?

  


  thank you so much and many greets iceget

  


  currently i have created only a single image with that function :
ffmpeg -loop 1 -i hex1.png -c:v libx264 -t 10 -pix_fmt yuv420p video.mp4

  


• The phenomenon of missing video data for the first part 1 to 2 seconds in streaming

  22 novembre 2022, par 양관식

  The phenomenon of missing video data for the first part (1 to 2 seconds) in streaming - ffmpeg
(specific hls live streaming, intermittent occurrence)
( I'm using it to check the frame (fps) )

  


  [root@ ]# ffmpeg -i http://live_streaming_url/PATH/definst/sample.stream/playlist.m3u8 -t 1 -f null -
frame= 5 fps=0.0 q=-0.0 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=23.3x
video:3kB audio:188kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown

  


  ---

  


  When monitoring is performed by setting it to -t 10 (playtime), about 1 second of the first part is omitted, and only the frames for the next 9 seconds are added up
There is a phenomenon that is measured.

  


  [root@streaming_monitoring_test ~]# ffmpeg -i http://live_streaming_url/PATH/_definst_/sample.stream/playlist.m3u8 -t 10 -f null -
ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 7 (GCC)
  configuration: --enable-demuxer=dash --enable-libxml2
**frame=  277 fps=134 q=-0.0 Lsize=N/A time=00:00:10.00 bitrate=N/A speed=4.84x    
video:145kB audio:1875kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown**

------------------------------------------------------------------------------------------------------



  


  The reason for missing video data in the front part is under investigation
As a solution, the problem seems to be resolved when monitoring is carried out by adjusting the playback start time (-ss).

  


  ffmpeg -i http://live_streaming_url/PATH/definst/sample.stream/playlist.m3u8 -ss 10 -t 1 -f null –
frame= 29 fps=7.2 q=-0.0 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=0.249x
  
video:15kB audio:188kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown

  


  ---

  


  but.... Why is the video data missing for the first part (1 to 2 seconds) checked ?

  


  thankyou...

  


• How to use ffmpeg to record audio from a video for first 10 seconds in Python

  13 novembre 2022, par S Andrew

  I have RTSP stream coming from a camera which also has audio. My goal is to save the audio. To do this, I have below code :

  


  import ffmpeg&#xA;ffmpeg.input("rtsp://john:<pwd>@192.168.10.111:5545/Streaming/Channels/291/").output("test.wav", map="0:a:0").run&#xA;</pwd>

  


  When I terminate the Python script, it saves the test.wav file which has just the audio from the rtsp stream. Now I am trying to save the first 10 sec from the stream into 1 file and then the next 10sec in another file and then it keeps on going until terminated.

  


  To do this, I have thought of putting the ffmpeg stream in a separate thread and to schedule that thread to run every 10 sec. This way a new stream will create which will save the audio for 10sec and will exit, and then this keeps on going. But to achieve this, I need to know how can we just save the initial 10 sec from the stream.