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• Concatting videos leads to audio async

  2 juin 2019, par Alex

  I am converting videos of different sources and one-image-slideshows like this

  ffmpeg -y -ss 00:00:00.077 -to 00:00:03.980 -fflags +igndts -i "GOPR2774.MP4" -r 60 -c:v libx264 -copytb 1 -af afade=t=in:ss=0:d=1,afade=t=out:st='00\:00\:02.903':d=1 36.mp4
  
  ffmpeg -y -i 36.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts 36f.ts
  
  ffmpeg -y -loop 1 -fflags +igndts -i "IMG_20190601_184039.jpg" -t 1 -f lavfi -i anullsrc -c:a aac -ac 2 -ar 48000 -b:a 118k -c:v libx264 -copytb 1 -pix_fmt yuv420p -r 60 -shortest 37.mp4
  
  ffmpeg -y -i 37.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts 37f.ts
  
  ffmpeg -y -ss 00:00:05.072 -to 00:00:10.883 -fflags +igndts -i "VID_20190601_184513.mp4" -r 60 -c:v libx264 -copytb 1 -vf reverse -af afade=t=in:ss=0:d=1,afade=t=out:st='00\:00\:04.811':d=1,areverse 38.mp4
  
  ffmpeg -y -i 38.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts 38f.ts
  
  ffmpeg -y -ss 00:00:03.078 -to 00:00:08.591 -fflags +igndts -i "GOPR2775.MP4" -r 60 -c:v libx264 -copytb 1 -vf reverse -af afade=t=in:ss=0:d=1,afade=t=out:st='00\:00\:04.513':d=1,areverse 39.mp4
  
  ffmpeg -y -i 39.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts 39f.ts

  and I concat them like this

  ffmpeg -y -i "concat:36f.ts|37f.ts|38f.ts|39f.ts" -c copy "result.mp4"

  Yet whenever there is a picture-slideshow, audio from previous/following videos bleeds in. Like

  Video1 - Video2 - slideshow - Video3
  
  
  
  Video1Audio - Video2Audio - slideshow_With_Part_of_Video3Audio - Video3Audio_Async

  or

  Video1Audio - Video2Audio - slideshow_With_Part_of_Video2Audio - Video3Audio_Async

  The slideshow should be silent -i anullsrc.

  How to have the videos concatted the way they are ?

• I have a ffmpeg command to concatenate 300+ videos of different formats. What is the proper syntax for the concat complex filter ?

  25 avril 2022, par jokoon

  I plan to concatenate a large amount of video files of different formats and resolution, some without sound, and add a short black screen "pause" of about 0.5s between each.

  


  I wrote a python script to generate such command.

  


  I created a 0.5s video file using ffmpeg.exe -t 0.5 -f lavfi -i color=c=black:s=640x480 -c:v libx264 -tune stillimage -pix_fmt yuv420p blank500ms.mp4.

  


  I then added a silent audio to it with -f lavfi -i anullsrc -c:v copy -c:a aac -shortest

  


  I now have the problem of adding a blank audio track for streams without one, but I don't want to generate new file, I want to add it to my complex filter.

  


  This is my complex script and generate command.

  


  The command (there are line returns, because I send this with the python subprocess module)

  


  ffmpeg.exe
-i
input0.mp4
-i
input1.mp4
-i
input2.mp4
-i
input3.mp4
-i
input4.mp4
-i
input5.mp4
-i
input6.mp4
-i
input7.mp4
-i
input8.mp4
-i
input9.mp4
-i
input10.mp4
-f
lavfi
-i
anullsrc
-filter_complex_script
C:/filter_complex_script.txt
-map
"[final_video]"
-map
"[final_audio]"
output.mp4


  


  The complex_filter_script :

  


  [0]fps=24[fps0];
[fps0]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:(ow-iw)/2:(oh-ih)/2,setsar=1,setpts=PTS-STARTPTS[rescaled0];
[1]fps=24[fps1];
[fps1]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:(ow-iw)/2:(oh-ih)/2,setsar=1,setpts=PTS-STARTPTS[rescaled1];
[2]fps=24[fps2];
[fps2]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:(ow-iw)/2:(oh-ih)/2,setsar=1,setpts=PTS-STARTPTS[rescaled2];
[3]fps=24[fps3];
[fps3]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:(ow-iw)/2:(oh-ih)/2,setsar=1,setpts=PTS-STARTPTS[rescaled3];
[4]fps=24[fps4];
[fps4]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:(ow-iw)/2:(oh-ih)/2,setsar=1,setpts=PTS-STARTPTS[rescaled4];
[5]fps=24[fps5];
[fps5]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:(ow-iw)/2:(oh-ih)/2,setsar=1,setpts=PTS-STARTPTS[rescaled5];
[6]fps=24[fps6];
[fps6]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:(ow-iw)/2:(oh-ih)/2,setsar=1,setpts=PTS-STARTPTS[rescaled6];
[7]fps=24[fps7];
[fps7]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:(ow-iw)/2:(oh-ih)/2,setsar=1,setpts=PTS-STARTPTS[rescaled7];
[8]fps=24[fps8];
[fps8]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:(ow-iw)/2:(oh-ih)/2,setsar=1,setpts=PTS-STARTPTS[rescaled8];
[9]fps=24[fps9];
[fps9]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:(ow-iw)/2:(oh-ih)/2,setsar=1,setpts=PTS-STARTPTS[rescaled9];
[10]fps=24[fps10];
[fps10]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:(ow-iw)/2:(oh-ih)/2,setsar=1,setpts=PTS-STARTPTS[rescaled10];
[10]split=10[blank0][blank1][blank2][blank3][blank4][blank5][blank6][blank7][blank8][blank9];
[rescaled0:v][0:a][blank0][rescaled1:v][1:a][blank1][rescaled2:v][2:a][blank2][rescaled3:v][3:a][blank3][rescaled4:v][4:a][blank4][rescaled5:v][5:a][blank5][rescaled6:v][11:a][blank6][rescaled7:v][11:a][blank7][rescaled8:v][11:a][blank8][rescaled9:v][11:a][blank9]concat=n=22:v=1:a=1[final_video][final_audio]


  


  As you can see, some video use [11:a], because it's a silent audio stream.

  


  input10.mp4, mapped to [10] and then split (or "cloned") into blanked0 to 9, is a short pause separator.

  


  ffmpeg tells me the error

  


  [Parsed_split_55 @ 000001591c33b280] Media type mismatch between the 'Parsed_split_55' filter output pad 1 (video) and the 'Parsed_concat_56' filter input pad 5 (audio)
[AVFilterGraph @ 000001591bf1e6c0] Cannot create the link split:1 -> concat:5
Error initializing complex filters.
Invalid argument


  


  I'm a bit lost when it comes to using the [X:Y:Z] syntax, and how the order matter in the concat argument list.

  


  I'm open to any other suggestion to solve my problem. I would rather do this in a single command, without intermediate file.

  


  EDIT :

  


  For details, I already wrote a large concat+xstack filter that worked well with 8GB of memory.

  


  In this case, there are a lot of inputs, but those inputs are small, most of them are between 1 and 10MB, so it would probably not generate out-of-memory problems, although I'm not certain.

  


• ffmpeg concat mp4s - adding audio and using shortest not lasting for the concatenated mp4

  23 mars 2023, par Gregor Sotošek

  I'd like to create an mp4 with audio.
I need to combine :

  


  

  1. Video - pt1 (made from cca 30 images : im1.jpg, im2.jpg . . . ) - length cca 6 secs

  


  2. Video - pt2 (made of single Image (logo.png) - length cca 3 secs

  


  3. Audio should be played all the time of combined video duration. Initially is cca 30 secs long, but should only be played for (6 + 3 secs), then cut.
I am using filter_complex and this is my command. It is written as text, so that I can use line breaks properly.

  


  


  ffmpeg ^

  


  -framerate 5 -i happy/im%d.jpg ^

  


  -loop 1 -t 3 -i logoBlack.png ^

  


  -i techno1.mp3 ^

  


  -filter_complex ^

  


  "[0:v]scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920 :(ow-iw)/2 :(oh-ih)/2,setsar=1[v0] ;^

  


  [1:v]scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920 :(ow-iw)/2 :(oh-ih)/2,setsar=1,drawtext=text='742 pointz, nize':x=(w-text_w)/2:y=300:fontfile=fonts.ttf:fontsize=100:fontcolor=white[v1] ;^

  


  [v0][v1] concat=n=2:v=1:a=0[out]" -r 5 -map "[out]" -map 2 -c:a aac -y -shortest video_withaudio.mp4

  


  

  • 

    



    


  


  


  The problem is that with this, I get mp4 with audio, however, audio is only 3 secs long (shortest param is considering the length of the shortest of the 2 initial videos).
How can I achieve, that shortest would be comparing total length of the video with the audio length.

  


  1.Am I suppose to add audio part within concat (-f lavfi -t 0.1 -i anullsrc) ? I tried adding dummy audio in concat but did not succeed. I believe I should be adding a single silent audio to the concatinated part, and after that perform shortest.. If anyone has an idea, would appreciate.