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• How to capture multiple screenshot from online video stream using ffmpeg with specific seek time

  9 août 2017, par Md. Mehedi Hasan

  I’m using ffmpeg to take screenshot from online video stream. I want to seek multiple timeline. I’ve used the following command to capture 1 screenshot by seek command :
  ffmpeg -ss 00:02:10 -i "stream-url" -frames:v 1 out1.jpg

  How I can take multiple screenshot via multiple seek time. I’ve searched for the solution but no success.

  I’ve used the following command to take multiple screenshot as follows :
  ffmpeg -noaccurate_seek -ss 00:01:10 -i "stream-url" -map 0:v:0 -vframes 1 -f mpeg "thumb/output_01.jpg" -ss 00:02:10 -i "stream-url" -map 1:v:0 -vframes 1 -f mpeg "thumb/output_02.jpg"

  Is there any way to generate screenshots from same input via seek command ? How to make it more faster ? How to skip multiple input(-i param) ? I’ve also tried with other commands but those are more slower. Can anyone help me ?

• German umlauts in ffmpeg drawtext filter

  15 août 2020, par Gert Gottschalk

  I need help getting german umlauts 'äüö' displayed properly/(at all) in ffmpeg drawtext filter. I can't say at this time if my inability comes from lack of ffmpeg know-how or machine configuration or both. Your input is much appreciated.

  



  In ffmpeg cmd line I have :

  



  /home/tools/bin/ffmpeg -loop 1 -i RAW2TIF_01_png_1080/IMG_1119.png -c:v libx264 -vf drawtext="fontsize=60:fontcolor=yellow:fontfile=/usr/share/fonts/truetype/freefont/FreeSans.ttf:textfile=./Scripts/header_text.txt:x=(w-text_w)/2:y=(h-text_h-line_h)/2" -t 10 -pix_fmt yuv420p  -crf 16 -r 24 -y ./Video/header_txt.mp4


  



  Note the 'drawtext' call.

  



  My linux machine where I run ffmpeg is setup for US keyboard and characters. So my first roadblock is to get the umlauts into the text in some editor. I tried typing 'alt-numerical' sequences, but the special characters will not show in vi, vim, emacs.

  



  If I were to have the special characters in a textfile I would not know if/how ffmpeg is able to handle them.

  



  A search on popular engine for 'ffmpeg drawtext umlaut' does not return any (for me) meaningful returns.

  



  Thanks,
Gert

  


• Online RTMP radio with Python + FFmpeg + Nginx : unable to have a continuous output stream

  2 décembre 2023, par Igor Longo

  Thinking about an application similar to an online radio, I'm trying to transmit a sequence of audio files chosen by the user, where he chooses which file will be played in the sequence, sufficiently in advance for the reproduction not to be muted. I'm using FFmpeg in a Python script and an RTMP server running Nginx.
The problem is that interrupting the transmission between one file and another appears to be breaking the transmission on output. Sometimes files are skipped and other times it simply crashes for the client.

  


  I have already tried transmitting the sequence of files in real time, using '-re', and I have also tried not using '-re', creating a custom queue manager in Python with the intention of trying to keep only 'n' files in the server buffer .
Below is an excerpt of the code :

  


  ffmpeg_command = [
'ffmpeg',
'-loglevel', 'warning',
# '-re', # read input at native frame rate
'-i', file_path,
'-c:a', 'aac',
'-ar', '44100',
'-bufsize', '1024k',
'-af', 'atempo=1.0',
'-b:a', '128k',
'-f', 'flv',
'-flvflags', 'no_duration_filesize',
rtmp_url # server url
]
subprocess.run(ffmpeg_command, check=True)

  


  Any tips on how I can resolve this ?