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• Ffmpeg seeking with m3u8 ineffective

  22 septembre 2020, par Lemon Sky

  Following the answer at Ffmpeg inaccurate cutting with ts and m3u8 files despite resamping audio filter, I am cutting some portion out of an m3u8 file.

  


  My m3u8 has a segment every 4 seconds, so I seek to a location around 10 seconds before the cutting point with -ss before -i. Then adjust position with -ss after -i.

  


  Here are two examples where the starting cut points are off by 1s :

  


  ffmpeg -y -ss 0:03:22 -start_at_zero -i http://tyberis.com/CFTE-AM_2020-08-28_23-00-00.m3u8 -ss 1 -t 0:00:10 322.wav


  


  ffmpeg -y -ss 0:03:23 -start_at_zero -i http://tyberis.com/CFTE-AM_2020-08-28_23-00-00.m3u8 -ss 1 -t 0:00:10 323.wav


  


  When I compare the two output files, they are binary same :

  


  diff 323.wav 322.wav -s
Files 323.wav and 322.wav are identical


  


  What am I doing wrong ? How can I accurately seek to the desired position ?

  


• How to do precise frame cut with ffmpeg ?

  25 juillet 2020, par Menglun Li

  I tried to cut multiple big videos into many small pieces. I know I can cut and export the small pieces one by one with "Premiere Elements", however that takes a lot time to export them manually. I couldn't find a way to do batch export in "Premiere Elements".

  


  I wrote down the starting and ending points of the small videos from Premiere Elements' timeline viewer, then I created a batch file to use ffmpeg for batch cutting. Below is one of the cutting command in the batch file.

  


  ffmpeg -i input.mp4 -ss 00:20:45.09 -to 00:23:01.00 -c:v libx264 -c:a aac output5.mp4 


  


  I compared the video that was cut by ffmpeg and the video was exported by Premiere Elements. I found sometime they are not starting and ending at the same frame, and it is not consistent either. Both the starting and ending frame that was cut by ffmpeg can drift forward or backward 6-9 frames from the frame number showed in Premiere Elements.

  


  How do I make sure ffmpeg has the precise frame cut ? Thanks in advance.

  


• Discord Bot // Voice Client Returns NoneType

  1er mai 2022, par DimKewl

  Experimenting with Discord and Python followed a couple of guides and created a bot that could play music from streaming URLs.

  


  However, now for the same code, I get Attribute Error : 'NoneType' object exceptions.

  


  Exception snippet
Console Snapshot

  


  The actual method goes like this :

  


  .
.
    FFMPEG_OPTIONS = {
    "before_options": "-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5",
    "options": "-vn -sn -dn"
}

@commands.command()
async def radio(self,ctx,url):
    await self.join(ctx)
    await self.playStreamUrlLogic(ctx,url);

async def playStreamUrlLogic(self, ctx, url):
    source = await discord.FFmpegOpusAudio.from_probe(url, **self.FFMPEG_OPTIONS)
    await ctx.voice_client.play(source)
.
.


  


  Even though everything points to a non instantiated class when I debug I can see that there is a voice_client object with info
Snapshot from Debbuger property viewer

  


  I already tried to use FFMPegPCMAudio as well but with no results.
Any insights would be helpful.