Recherche avancée

Sur d’autres sites (7952)

• FFMPEG : Specifying Output Stream Type When Combing Multiple Filters

  7 mai 2021, par Leonard Bedner

  I currently have 3 separate ffmpeg commands that do the following :

  


  

  1. Overlay a watermark on a video : ffmpeg -i samplegreen.webm -i foregrounds/myimage.png -r 30 -filter_complex "overlay=(W-w)/2:H-h" -af "adelay=700" output.mp4

  


  2. Overlay the results of 1) onto a beach video : ffmpeg -i backgrounds/beachsunsetmp4.mp4 -i output.mp4 -filter_complex "[1:v]chromakey=0x005d0b:0.1485:0.03[ckout];[0:v][ckout]overlay[o]" -map [o] -map 1:a -shortest somefolder/sample_video.mp4

  


  3. Merge the audio of the results of 2) with another audio file : ffmpeg -i somefolder/sample_video.mp4 -i backgrounds/beachsunsetmp4.mp3 -filter_complex '[0:a][1:a]amerge=inputs=2[a]' -map 0:v -map '[a]' -c:v copy -ac 2 -shortest anotherfolder/sample_video.mp4

  


  


  Now, this all works as intended, however, I was looking into attempting to combine them all into a single command, combining all the filters, like so :

  


  ffmpeg -i samplegreen.webm -i foregrounds/myimage.png -r 30 -i backgrounds/beachsunsetmp4.mp4 -i backgrounds/beachsunsetmp4.mp3 -filter_complex \
    "[0]overlay=(W-w)/2:H-h[output_1]; \
     [output_1]chromakey=0x005d0b:0.1485:0.03[ckout]; \
     [2:v][ckout]overlay[output_2]; \
     [output_2][3:a] amerge=inputs=2 [output_3]" \
    -af "adelay=700" -map [output_3] shortest final.mp4


  


  It fails with the following error (Media type mismatch between the 'Parsed_overlay_2' filter output pad 0 (video) and the 'Parsed_amerge_3' filter input pad 0 (audio)) :

  


  ffmpeg version 4.3.2 Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.2_1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, matroska,webm, from 'samplegreen.webm':
  Metadata:
    encoder         : Chrome
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0(eng): Video: vp8, yuv420p(progressive), 1280x720, SAR 1:1 DAR 16:9, 1k tbr, 1k tbn, 1k tbc (default)
    Metadata:
      alpha_mode      : 1
    Stream #0:1(eng): Audio: opus, 48000 Hz, mono, fltp (default)
Input #1, png_pipe, from 'foregrounds/myimage.png':
  Duration: N/A, bitrate: N/A
    Stream #1:0: Video: png, rgba(pc), 350x86, 25 tbr, 25 tbn, 25 tbc
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'backgrounds/beachsunsetmp4.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2021-02-16T18:24:40.000000Z
  Duration: 00:00:32.53, start: 0.000000, bitrate: 3032 kb/s
    Stream #2:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 3027 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      creation_time   : 2021-02-16T18:24:40.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      encoder         : AVC Coding
[mp3 @ 0x7f86cf809000] Estimating duration from bitrate, this may be inaccurate
Input #3, mp3, from 'backgrounds/beachsunsetmp4.mp3':
  Metadata:
    date            : 2021-02-18 06:49
    id3v2_priv.XMP  : <?xpacket begin="\xef\xbb\xbf" id="W5M0MpCehiHzreSzNTczkc9d"?>\x0a\x0a \x0a  s
    Stream #3:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
[Parsed_overlay_2 @ 0x7f86cd4039c0] Media type mismatch between the 'Parsed_overlay_2' filter output pad 0 (video) and the 'Parsed_amerge_3' filter input pad 0 (audio)
[AVFilterGraph @ 0x7f86cd402a40] Cannot create the link overlay:0 -> amerge:0
Error initializing complex filters.
Invalid argument


  


  As far as I can tell, the issue is that the filter, amerge, wants 2 audio streams. Normally, I could take the input stream argument (which is a video), and make it use the audio by doing something like [0:a][1:a]amerge=inputs=2[results]. However, since my input stream is the output of a preceding filter, that doesn't seem to work (i.e. [output_2:a]). It bombs out with :

  


  [matroska,webm @ 0x7fecca000000] Invalid stream specifier: output_2:a.
    Last message repeated 1 times
Stream specifier 'output_2:a' in filtergraph description [0]overlay=(W-w)/2:H-h[output_1];      [output_1]chromakey=0x005d0b:0.1485:0.03[ckout];      [2:v][ckout]overlay[output_2];      [output_2:a][3:a] amerge=inputs=2 [output_3] matches no streams.


  


  So all of that said... Is there a way to specify that I'd like to use the audio stream from the output of a preceding filter ? Or any other ways to combine all of these filters into a single command ?

  


  Thanks.

  


  Any help would be greatly appreciated !

  


• C# / FFMPEG - Is this the best way to programmatically combine multiple video files in different formats and encodings into one ?

  28 avril 2021, par buggybud

  I've been trying to concat multiple videos into one. These videos may have different file types and extensions. As it stands I am only working with MP4 files that seem to have different resolutions, framerates, you name it.

  


  After having first followed the Stackoverflow answers that talked about using an intermediate file (convert all the files into one format, then concate that) I also came across a solution that uses what I think is called a 'concat video filter.'

  


  This would allow me to ignore the intermediate steps and just combine all the files by specifying their individual settings within one single FFMPEG command.

  


                  -i 1.mp4 -i 2.mp4 -i 3.mp4 -filter_complex \
                "[0:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1,setsar=1,fps=30,format=yuv420p[v0];
                 [1:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1,setsar=1,fps=30,format=yuv420p[v1];
                 [2:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1,setsar=1,fps=30,format=yuv420p[v2];
                 [v0][0:a][v1][1:a][v2][2:a]concat=n=3:v=1:a=1[v][a]" \
                -map "[v]" -map "[a]" -c:v libx264 -c:a aac -movflags +faststart output.mp4


  


  Provided above is the snippet that shows you how to combine three videos into one. I've used this Snippet within my code but as opposed to manually specifying the input files, and not finding a way to use the list file, I came across the very hacky solution to programatically create the above command parameters.

  


              var command = "";

            for (var i = 0; i < video_paths.Count; i++)
            {
                command += $"-i \"{video_paths[i]}\" ";
            }

            command += "-filter_complex ";
            command += "\"";

            for (var i = 0; i < video_paths.Count; i++)
            {
                command += $"[{i}:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1,setsar=1,fps=30,format=yuv420p[v{i}];";
            }

            for (var i = 0; i < video_paths.Count; i++)
            {
                command += $"[v{i}][{i}:a]";
            }

            command += $"concat=n={video_paths.Count}:v=1:a=1[v][a]\" ";
            command += $"-map \"[v]\" -map \"[a]\" -c:v libx264 -c:a aac -movflags +faststart \"{path}\"";

            ffmpeg(command);


  


  The above code is the solution to my problem. It works.

  


  The reason I made this Stackoverflow question is the following : Is this the best way to programatically make the arguments ? What is the maximum string limit of these arguments as my video paths are all absolute paths ? How can I make this look nicer and less chaotic in code ?

  


  Bud

  


• Combine multiple images into a video using ffmpeg [closed]

  13 avril 2021, par Mayank Thapliyal

  I want to combine multiple images into a video. I will use ffmpeg with Python as Python script will help me select images accordingly. And I have to fulfill multiple conditions :

  


  


  1. Frame-rate will be 0.2 (5 second for each image).

     


  


  2. Screen-Ratio should be 18:9. But all images have different dimensions. And neither I want to crop nor I want to stretch them. So I want to pad them with a black background.

     


  


  3. Ability to add background music.

     


  


  


  But the issue is that I am not able to adjust images. Either images get stretched to full screen or they get cropped. So currently first I use PIL library to adjust images first then combine them with ffmpeg. But it takes a good amount of time and I don't like this approach.

  


  Please help me solve my issue by only using ffmpeg (I guess that it will be fast enough).