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• Concatination of images and videos in FFMpeg [closed]

  29 octobre 2023, par Juliano David Hilario

  I've been trying to concat pieces of videos with mix of images in FFMpeg and I can not achieve desired results. I'm trying to create a mock interview project for a friend, she answers the questions from a script. The question should be flashed in the screen before the footage of her answering is shown. The videos are encoded in H.265, with frame rate of 30fps, (via mediainfo) and when I try to concat the videos and images using the concat demuxer, it shows this message in rapid succession and only output the first image in the given duration in the output file : (meaning it failed when concating the video, I assume this is due to the fact that demuxed images doesn't have audio streams.)

  


  [png @ 0x55b4a4cb3540] Invalid PNG signature 0x3DB0201D430.
Error while decoding stream #0:0: Invalid data found when processing input


  


  the command I've used :

  


  ffmpeg -hide_banner -y -f concat -safe 0 -i concat.con -r 30 -c:v libx265 -c:a aac -pix_fmt yuv420p out.mp4


  


  the slice of concat.con file :

  


  file slides/1.png
duration 6
file parts/1.mp4
file slides/2.png
duration 8
file parts/2.mp4
file slides/3.png
duration 9
file parts/3.mp4
. . .
duration 12
file parts/9.mp4
file slides/10.png
duration 9
file parts/10.mp4



  


  Since, I need to get this done if possible today, I tried this route of turning the images into videos by this command :

  


  #!/bin/sh

ffmpeg -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -loop 1 -i "${1}.png" -c:v libx265 -r 30 -c:a aac -t "$2" -pix_fmt yuv420p "${1}_slide.mp4"


  


  This does create the desired result of a static video without sound but still has an audio channel (which is a pre-requisite for the concat demuxer), but when I concat it with the same command above with videos, the videos' audio desyncs and advances, now the video delays with the audio, which is not obviously feasable for the project. I suspect it has to do with frames and PTS, as MPV (a media player) logs when the duration of the video enters the video that has been concatinated that the PTS is invalid, and says :

  


  Invalid audio PTS: 6.037188 -> 6.553832

Audio/Video desynchronisation detected! Possible reasons include too slow
hardware, temporary CPU spikes, broken drivers, and broken files. Audio
position will not match to the video (see A-V status field).


  


  Tried turning the pictures into an image, and was expecting it to atleast sync with the audio

  


• FFMPEG how to record aac codec audio same time with video ?

  13 décembre 2017, par Gomi Odabaşıoğlu

  I am trying to use FFMPEG console tools effectively. Now I can record video and audio same time but my issue audio is delaying. I use following code :

  C:\Users\gomid_000\Desktop\ffmpeg.exe -y -f dshow -i audio="Stereo Mix (Realtek High Definition Audio)" -f gdigrab -show_region 1 -framerate 60 -i desktop -map 0 -map 1 -c:v libx264 -preset ultrafast -pix_fmt yuv420p C:\Users\gomid_000\Desktop\out.mp4 -threads:1 4

  I want to use h264 - Intel quick sync codec for video and for the audio
  AAC codec My machine accepts it.

  I tried to use Intel QSV with following code, is that correct ? (scroll "-c:v h264_qsv" part of the code)

  C:\Users\gomid_000\Desktop\ffmpeg.exe -y -f dshow -i audio="Stereo Mix (Realtek High Definition Audio)" -f gdigrab -show_region 1 -framerate 60 -i desktop -map 0 -map 1 -c:v h264_qsv -pix_fmt yuv420p C:\Users\gomid_000\Desktop\out.mp4

  Still do not know How to use AAC to record audio and keeep video and audio matching times automaticly. It is not installed maybe (?) (I do not know how to tell this in English will try :"Person speaks but audio comes very near but delays a little bit when I try bandicam they just match each other without any delay this is not hardware related.")

• Interval option when downloading HLS format videos published on Internet sites using ffmpeg

  28 septembre 2021, par atsu8492

  I'm trying to download HLS format video as mp4 using ffmpeg.

  


  I don't want to bother the server side due to excessive requests, so I want to create an interval for ts file acquisition.

  


  When I actually run ffmpeg, I sometimes get an HTTP 429 error as shown below.

  


  In addition, it looked like there are no good options in ffmpeg.

  


  [https @ 000001bfef570100] Opening 'https://～/ts/9.ts' for reading
[https @ 000001bfeef31140] HTTP error 429 Too Many Requests
[hls @ 000001bfee6be200] keepalive request failed for 'https://～/ts/9.ts' with error: 'Server returned 4XX Client Error, but not one of 40{0,1,3,4}' when opening url, retrying with new connection
[https @ 000001bfef570100] Opening 'https://～/ts/9.ts' for reading
[https @ 000001bfef570100] Opening 'https://～/ts/10.ts' for reading
[https @ 000001bfef570100] Opening 'https://～/ts/11.ts' for reading
[https @ 000001bfef570100] Opening 'https://～/ts/12.ts' for reading
[https @ 000001bfef570100] Opening 'https://～/ts/13.ts' for reading
[https @ 000001bfeef31140] HTTP error 429 Too Many Requests
[hls @ 000001bfee6be200] keepalive request failed for 'https://～/ts/13.ts' with error: 'Server returned 4XX Client Error, but not one of 40{0,1,3,4}' when opening url, retrying with new connection
[https @ 000001bfef570100] Opening 'https://～/ts/13.ts' for reading
…


  


  Can you come up with any good way ?

  


  I'm not good at English, so I may not be able to respond well. sorry.
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