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• 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 ?

  


• avcodec/hevcdec : Check early whether film grain is supported, fix race

  22 août 2022, par Andreas Rheinhardt

  avcodec/hevcdec : Check early whether film grain is supported, fix race
  Applying film grain happens after ff_thread_finish_setup(),
  
  so the parameters synced in hevc_update_thread_context() must not
  
  be modified. But this is exactly what happens in case applying
  
  film grain fails. (The likely result is that in case of frame threading
  
  an uninitialized frame is output.)
  Given that it is actually very easy to know in advance whether
  
  ff_h274_apply_film_grain() supports a given set of parameters,
  
  one can check for this before ff_thread_finish_setup()
  
  and avoid allocating an unused buffer lateron.
  Reviewed-by : Niklas Haas <ffmpeg@haasn.xyz>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/h274.h
  • [DH] libavcodec/hevcdec.c
  • [DH] libavcodec/hevcdec.h

• How to extract duration time of online videos listed in a text file

  22 août 2022, par Ginofalaci

  I need to check the duration of thousand of videos online. I m trying to get this from a text file containing the urls of the videos.

  


  I have those two commands that are working great with one url, but i don't find out how to get it work with a list within a file text.

  


  fmpeg -i My.url 2>&1 | grep "Duration"| cut -d ' ' -f 4 | sed s/,//


  


  or this :

  


  ffmpeg -i my.url 2>&1 | grep Duration | sed 's/Duration: \(.*\), start/\1/g'


  


  im trying :

  


  fmpeg -i listurls.txt 2>&1 | grep "Duration"| cut -d ' ' -f 4 | sed s/,//


  


  or this :

  


  ffmpeg -i listurls.txt 2>&1 | grep Duration | sed 's/Duration: \(.*\), start/\1/g'


  


  my file text is like this :

  


  myurl1.m3u8
  
myurl2.m3u8
  
myurl3.m3u8
  
myurl4.m3u8
  
myurl5.m3u8

  


  I've also tried :

  


  file 'myurl1.m3u8'
  
file 'myurl2.m3u8'
  
file 'myurl3.m3u8'
  
file 'myurl4.m3u8'
  
file 'myurl5.m3u8'

  


  but it doesn't work.

  


  Also some videos might not be online anymore, but still referenced, so it would give no result, but I would like if possible to have the result "0" than nothing, it will be much easier to use the results afterwards.

  


  (awk, sed, mediainfo, exiftool, any will be good, ) Thanks in advance.