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• Google Speech API doesn't give correct result when audio is sent in file

  4 août 2012, par Cupidvogel

  I chanced upon the article at Google Speech API which suggested a mechanism for extracting text from audio file through Perl. Now I have recorded a audio file, which you will find at http://vocaroo.com/i/s0lPN5d3YQJj. It is a simple piece of audio, reading I love you. When I go to the Google speech API in Chrome, and speak those words, I get the right result. When I try the code at the above mentioned link with the audio file I pointed out, it returns strange results, like logan. How can I make it more accurate ? This is just a sample audio, what I am generally doing is extracting the audio from a video file through FFMpeg using something like ffmpeg -i input.avi -vn -ar 44100 -ac 2 -ab 192 -f mp3 output.mp3, followed by ffmpeg -i input.mp3 output.flac.

• Non-monotonous DTS in output stream previous current changing to This may result in incorrect timestamps in the output file

  21 juillet 2020, par Vitalis Hommel

  I am having a file.txt with rather close snippets

  


  file 'input.mp4'
inpoint 1.5402465510368346
outpoint 2.722609395980835
file 'input.mp4'
inpoint 3.192511146068573
outpoint 7.074568028450012
file 'input.mp4'
inpoint 7.851800565719604
outpoint 9.023683423995971
file 'input.mp4'
inpoint 10.054571752548219
outpoint 12.008032734394073
file 'input.mp4'
inpoint 18.70977670431137
outpoint 21.20993923664093
file 'input.mp4'
inpoint 24.51183382153511
outpoint 26.465287650823594
...


  


  I concat them with

  


  ffmpeg -safe 0 -f concat -i file.txt out.mp4


  


  and I tried

  


  ffmpeg -use_wallclock_as_timestamps 1 -safe 0 -f concat -i file.txt out.mp4


  


  Yet I get

  


  [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 2069, current: 2067; changing to 2070. This may result in incorrect timestamps in the output file.
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 2070, current: 2067; changing to 2071. This may result in incorrect timestamps in the output file.
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 2071, current: 2067; changing to 2072. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 2758, current: 2756; changing to 2759. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
    Last message repeated 5 times
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7581, current: 7579; changing to 7582. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7582, current: 7579; changing to 7583. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7583, current: 7579; changing to 7584. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7584, current: 7579; changing to 7585. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7585, current: 7579; changing to 7586. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7586, current: 7579; changing to 7587. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7587, current: 7579; changing to 7588. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7588, current: 7579; changing to 7589. This may result in incorrect timestamps in the output file.
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7589, current: 7579; changing to 7590. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7590, current: 7579; changing to 7591. This may result in incorrect timestamps in the output file.
[aac @ 00000178c50f8a80] Queue input is backward in time


  


  And the final file is cut at wrong places.

  


  How to make the file.txt work ?

  


• how to save ffprobe result in json

  22 août 2018, par user1083237

  i am using the following :
  ffprobe -i bunny.mp4 -v quiet -select_streams v -print_format json -show_entries frame=pkt_pts_time,pict_type|grep -B 1 pict_type=I

  so i can save time of index frames in json file.
  also the command works just fine without the :
  "print formqt json",
  it doesnt seem to work after i add it.
  i have tried "print format json " commands like :
  ffprobe -v quiet -print_format json -show_format -show_streams "lolwut.mp4"
  and it works just fine.
  what might be the problem ?