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• ffmpeg (fluent ffmpeg) wrong length while converting mp4 (or mp3) to wav

  18 février 2019, par almarc

  The code :

  ytdl(URL, { quality: "18" })
  
      .pipe(fs.createWriteStream('song.mp4')).on("finish", () => {
  
          var mp4 = "song.mp4"
  
  
  
          ffmpeg({ source:mp4 })
  
          .inputFormat('mp4')
  
          .format('wav')
  
          .on('error', (err) => console.error(err))
  
          .on('end', () => console.log('Finished!'))
  
          .pipe(fs.createWriteStream('song.wav'), {
  
              end: true
  
          });
  
      })

  First it downloads an MP4 file from YouTube, using the ytdl library. Then, when the downloading is finished (the .mp4 file’s length is correct, 5 minutes), using the fluent-ffmpeg library, it converts the .mp4 file to .wav. No errors, it’s succesfull. But the .wav file is almost 7 hours long.
  The first 5 minutes are good, the content from that .mp4 file. Then, everything further is empty.

  I also tried to first convert it to .mp3, and then to .wav, but the results are still the same. 7 hour long track.

  Using ffmpeg from the command line gives the same results.

• ffmpeg with double ethernet interfaces works wrong

  21 janvier 2019, par CharlesCui

  A server with double interfaces.

  1. One(eht0) is used for WAN which provides http/ssh services for internet users.

  2. The other(eth1) is used to receive multicast data from intranet.

  218.108.132.177 is public network gateway.

  125.210.198.1 is private network gateway.

  233.49.3.*/24 is multicast address.

  10.0.11.*/24 is the source of multicast data.

  When the route table is like below, ffmpeg can’t read the udp data from eth1, ffmpeg hung up :

  rrca@rcasnap02:~$ route
  
  Kernel IP routing table
  
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  
  218.108.132.176 *               255.255.255.252 U     0      0        0 eth0
  
  125.210.198.0   *               255.255.255.240 U     0      0        0 eth1
  
  default         218.108.132.177 0.0.0.0         UG    100    0        0 eth0
  
  default         125.210.198.1   0.0.0.0         UG    100    0        0 eth1

  or

  rrca@rcasnap02:~$ route
  
  Kernel IP routing table
  
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  
  218.108.132.176 *               255.255.255.252 U     0      0        0 eth0
  
  125.210.198.0   *               255.255.255.240 U     0      0        0 eth1
  
  default         218.108.132.177 0.0.0.0         UG    100    0        0 eth0
  
  10.0.11.0       125.210.198.1   0.0.0.0         UG    100    0        0 eth1

  or

  rrca@rcasnap02:~$ route
  
  Kernel IP routing table
  
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  
  218.108.132.176 *               255.255.255.252 U     0      0        0 eth0
  
  125.210.198.0   *               255.255.255.240 U     0      0        0 eth1
  
  default         218.108.132.177 0.0.0.0         UG    100    0        0 eth0
  
  233.49.3.0      125.210.198.1   255.255.255.0   UG    100    0        0 eth1

  I want to the ffmpeg work right,but now I think the two default route in route table disturb eachother, and I take a try, when the public gateway route is deleted, or the private gateway route is at the head of public default gateway route, ffmpeg works well, I think it read multicast from eth1.But the route table is not thus, ffmpeg can’t read data from eth1, I think it read data on eth0(which is not private network interface).

  How to do ffmpeg works well with two interfaces at the same time ?

• ffmpeg : cut video but getting the wrong length

  2 août 2024, par nathan wu

  I'm using ffmpeg to cut a video.
Here is the input information :

  



      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 5113 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)


  



  And this is the command I use :

  



      ffmpeg -y -ss 10 -t 5 -i test.mp4 -c copy output.mp4


  



  But the output duration is about 9.66 seconds.

  



  It worked when I removed the '-c copy' option or the input doesn't contain the 'tv, bt709' tag. But it's slower.

  



  I wonder how I can use '-c copy' and get the right piece of video I need ?