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• FFMPEG concatenating videos with and without audios

  6 juillet 2023, par najam ulhassan

  I'm concatenating multiple videos using FFMPEG, with and without audios to certain videos, i'm using following command but FFMPEG generating error over (:a audio filer) Stream specifier ':a' in filtergraph description, matches no streams.
Even I'm using anullsrc for videos having no sound.

  


  Command :

  


  ffmpeg -i Video_202306_23_102709.mp4 -i Video_202306_23_102838.mp4 -i Screenshot_298.mp4 -i MG16885528.mp4
-f lavfi -i anullsrc=channel_layout=stereo:sample_rate=48000
-filter_complex
[0:v]scale=1280x720:force_original_aspect_ratio=decrease,pad=1280x720 :-1 :-1,setsar=1,fps=24,format=yuv420p[v0] ;
[1:v]scale=1280x720:force_original_aspect_ratio=decrease,pad=1280x720 :-1 :-1,setsar=1,fps=24,format=yuv420p[v1] ;
[2:v]scale=1280x720:force_original_aspect_ratio=decrease,pad=1280x720 :-1 :-1,setsar=1,fps=24,format=yuv420p[v2] ;
[3:v]scale=1280x720:force_original_aspect_ratio=decrease,pad=1280x720 :-1 :-1,setsar=1,fps=24,format=yuv420p[v3] ;
[0:a]aformat=sample_rates=48000:channel_layouts=stereo[a0] ;
[1:a]aformat=sample_rates=48000:channel_layouts=stereo[a1] ;
[2:a]aformat=sample_rates=48000:channel_layouts=stereo[a2] ;
[3:a]aformat=sample_rates=48000:channel_layouts=stereo[a3] ;
[v0][a0][v1][a1][v2][a2][v3][a3]concat=n=4:v=1:a=1[v][a]
-map "[v]" -map "[a]" -c:v libx264 -crf 28 -c:a aac
-movflags +faststart FinalTempVideo.mp4

  


  I'm following this query Concatenate Video in ffmpegby llogan,
It seems the :a filter is not utilize with the videos having no sound, but issue is that I couldn't distinguish between the videos having audio or not.
Moreover anullsrc is not making it a fix.

  


• concat selected videos in textfile using ffmpeg

  12 mai 2022, par tejas netradyne

  i want to select videos from file1.txt which contains

  


  

  1. file 'video1.mp4'

  


  2. file 'video2.mp4'

  


  3. file 'video3.mp4'

  


  


  using ffmpeg command i store them in file1.txt and concatenate it :

  


  command= ffmpeg -f concat -i < ( for f in *.mp4; do echo "file '$(pwd)/$f'"; done ) outputfile.mp4


  


  how to apply start and end to this so that i can select videos starting from video1.mp4 to video2.mp4 to be concatenated using python.

  


• You can generate a video with audio and videos clip with ffmpeg

  8 mai 2018, par Jhonny Luis

  I am making an application in which I have to generate a single video clip of x duration, I was recommended to use the ffmpeg but I do not know if it could be created and if possible how the structure would be, since I understand that you need a file with a structure in which the path is established in this case videos and audio, I am working on codeigniter with php 7, I have already executed the ffmpeg to change the format of a video.

  The question is the following, from a database I bring the list of the route of the videos its duration and weight, equal with the audios, the thing is how I can do to create the video with ffmpeg from this.