Answers.Body: <p>You're setting <code>force_original_aspect_ratio</code> to <code>1</code> (<code>decrease</code>) so the videos can't be assumed to be the same resolution after scale. You'll need to pad the video to a common resolution and then reset the SAR.</p>
  <p>So,</p>
  <pre><code>scale=1024:576:force_original_aspect_ratio=1
  </code></pre>
  <p>should become</p>
  <pre><code>scale=1024:576:force_original_aspect_ratio=decrease,pad=1024:576:-1:-1,setsar=1
  </code></pre>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-08-30T12:56:43.483Z
Answers.Text: Thanks a lot, now it works
Answers.UserDisplayName: Matteo Pasini
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-08-30T12:24:37.403Z
Answers.LastActivityDate: 2023-08-30T12:24:37.403Z
Answers.UserDisplayName: Gyan
Body: <p>I need to concatenate n mp4 videos of different resolutions via <strong>ffmpeg</strong>. However, I am receiving an error despite the fact that in the <code>filter_complex</code> before performing the concat operation I scale all the vdeos to the same resolution:</p>
  <p>Example of the command with 3 videos:</p>
  <pre><code>ffmpeg -i video1.mp4 -i video2.mp4 -i video3.mp4 -filter_complex &quot;[0:v]scale=1024:576:force_original_aspect_ratio=1[v0]; [1:v]scale=1024:576:force_original_aspect_ratio=1[v1]; [2:v]scale=1024:576:force_original_aspect_ratio=1[v2]; [v0][0:a][v1][1:a][v2][2:a]concat=n=3:v=1:a=1[v][a]&quot; -map [v] -map [a] output.mp4
  </code></pre>
  <p>Output:</p>
  <pre><code>$ ffmpeg -i video1.mp4 -i video2.mp4 -i video3.mp4 -filter_complex &quot;[0:v]scale=1024:576:force_original_aspect_ratio=1[v0]; [1:v]scale=1024:576:force_original_aspect_ratio=1[v1]; [2:v]scale=1024:576:force_original_aspect_ratio=1[v2]; [v0][0:a][v1][1:a][v2][2:a]concat=n=3:v=1:a=1[v][a]&quot; -map [v] -map [a] output.mp4
  ffmpeg version 2023-08-28-git-b5273c619d-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
    built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
    configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-dxva2 --enable-d3d11va --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
    libavutil      58. 17.100 / 58. 17.100
    libavcodec     60. 23.100 / 60. 23.100
    libavformat    60. 10.101 / 60. 10.101
    libavdevice    60.  2.101 / 60.  2.101
    libavfilter     9. 11.100 /  9. 11.100
    libswscale      7.  3.100 /  7.  3.100
    libswresample   4. 11.100 /  4. 11.100
    libpostproc    57.  2.100 / 57.  2.100
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video1.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      creation_time   : 2021-10-08T12:31:56.000000Z
    Duration: 00:03:15.51, start: 0.000000, bitrate: 464 kb/s
    Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m, progressive), 1444x876 [SAR 1:1 DAR 361:219], 335 kb/s, 30 fps, 30 tbr, 30k tbn (default)
      Metadata:
        creation_time   : 2021-10-08T12:31:56.000000Z
        handler_name    : Mainconcept MP4 Video Media Handler
        vendor_id       : [0][0][0][0]
        encoder         : AVC Coding
    Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
      Metadata:
        creation_time   : 2021-10-08T12:31:56.000000Z
        handler_name    : Mainconcept MP4 Sound Media Handler
        vendor_id       : [0][0][0][0]
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'video2.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      creation_time   : 2023-02-28T15:42:03.000000Z
    Duration: 00:03:00.70, start: 0.000000, bitrate: 518 kb/s
    Stream #1:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m, progressive), 1796x970 [SAR 1:1 DAR 898:485], 390 kb/s, 30 fps, 30 tbr, 30k tbn (default)
      Metadata:
        creation_time   : 2023-02-28T15:42:03.000000Z
        handler_name    : Mainconcept MP4 Video Media Handler
        vendor_id       : [0][0][0][0]
        encoder         : AVC Coding
    Stream #1:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
      Metadata:
        creation_time   : 2023-02-28T15:42:03.000000Z
        handler_name    : Mainconcept MP4 Sound Media Handler
        vendor_id       : [0][0][0][0]
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'video3.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      creation_time   : 2023-02-27T11:18:11.000000Z
    Duration: 00:03:00.67, start: 0.000000, bitrate: 589 kb/s
    Stream #2:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m, progressive), 1800x970 [SAR 1:1 DAR 180:97], 461 kb/s, 30 fps, 30 tbr, 30k tbn (default)
      Metadata:
        creation_time   : 2023-02-27T11:18:11.000000Z
        handler_name    : Mainconcept MP4 Video Media Handler
        vendor_id       : [0][0][0][0]
        encoder         : AVC Coding
    Stream #2:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
      Metadata:
        creation_time   : 2023-02-27T11:18:11.000000Z
        handler_name    : Mainconcept MP4 Sound Media Handler
        vendor_id       : [0][0][0][0]
  File 'output.mp4' already exists. Overwrite? [y/N] y
  Stream mapping:
    Stream #0:0 (h264) -&gt; scale:default
    Stream #0:1 (aac) -&gt; concat
    Stream #1:0 (h264) -&gt; scale:default
    Stream #1:1 (aac) -&gt; concat
    Stream #2:0 (h264) -&gt; scale:default
    Stream #2:1 (aac) -&gt; concat
    concat -&gt; Stream #0:0 (libx264)
    concat -&gt; Stream #0:1 (aac)
  Press [q] to stop, [?] for help
  [Parsed_concat_3 @ 000001c73586c800] Input link in0:v0 parameters (size 1024x553, SAR 248297:248320) do not match the corresponding output link in0:v0 parameters (949x576, SAR 69312:69277)
  [Parsed_concat_3 @ 000001c73586c800] Failed to configure output pad on Parsed_concat_3
  [fc#0 @ 000001c735837640] Error reinitializing filters!
  Failed to inject frame into filter network: Invalid argument
  Error while filtering: Invalid argument
  [Parsed_concat_3 @ 000001c73586b300] Input link in0:v0 parameters (size 1024x553, SAR 248297:248320) do not match the corresponding output link in0:v0 parameters (949x576, SAR 69312:69277)
  [Parsed_concat_3 @ 000001c73586b300] Failed to configure output pad on Parsed_concat_3
  [fc#0 @ 000001c735837640] Error reinitializing filters!
  Failed to inject frame into filter network: Invalid argument
  [Parsed_concat_3 @ 000001c73586c600] Input link in0:v0 parameters (size 1024x553, SAR 248297:248320) do not match the corresponding output link in0:v0 parameters (949x576, SAR 69312:69277)
  [Parsed_concat_3 @ 000001c73586c600] Failed to configure output pad on Parsed_concat_3
  [fc#0 @ 000001c735837640] Error reinitializing filters!
  Failed to inject frame into filter network: Invalid argument
  [Parsed_concat_3 @ 000001c73586ce00] Input link in0:v0 parameters (size 1024x553, SAR 248297:248320) do not match the corresponding output link in0:v0 parameters (949x576, SAR 69312:69277)
  [Parsed_concat_3 @ 000001c73586ce00] Failed to configure output pad on Parsed_concat_3
  [fc#0 @ 000001c735837640] Error reinitializing filters!
  Failed to inject frame into filter network: Invalid argument
  [out#0/mp4 @ 000001c73710c900] Nothing was written into output file, because at least one of its streams received no packets. frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=N/A bitrate=N/A speed=N/A
  Conversion failed!
  </code></pre>
  <p>The solution provided to this problem in <a href="https://video.stackexchange.com/questions/25136/ffmpeg-concat-problem">this question</a> partially solves the problem, as the second concatenated video has no audio (the first one does), but I still can't figure out how to extend the solution to 3 or more videos.
  Anyone know how to help me?</p>
  
Tags: <ffmpeg><concatenation>
Title: ffmpeg error Input link parameters do not match the corresponding output link parameters
UserDisplayName: Matteo Pasini
ThreadText: # ffmpeg error Input link parameters do not match the corresponding output link parameters
  
  (Asked by: username_0 on 2023-08-30)
  
  I need to concatenate n mp4 videos of different resolutions via **ffmpeg**. However, I am receiving an error despite the fact that in the `filter_complex` before performing the concat operation I scale all the vdeos to the same resolution:
  
  Example of the command with 3 videos:
  
  ```
  ffmpeg -i video1.mp4 -i video2.mp4 -i video3.mp4 -filter_complex "[0:v]scale=1024:576:force_original_aspect_ratio=1[v0]; [1:v]scale=1024:576:force_original_aspect_ratio=1[v1]; [2:v]scale=1024:576:force_original_aspect_ratio=1[v2]; [v0][0:a][v1][1:a][v2][2:a]concat=n=3:v=1:a=1[v][a]" -map [v] -map [a] output.mp4
  
  ```
  
  Output:
  
  ```
  $ ffmpeg -i video1.mp4 -i video2.mp4 -i video3.mp4 -filter_complex "[0:v]scale=1024:576:force_original_aspect_ratio=1[v0]; [1:v]scale=1024:576:force_original_aspect_ratio=1[v1]; [2:v]scale=1024:576:force_original_aspect_ratio=1[v2]; [v0][0:a][v1][1:a][v2][2:a]concat=n=3:v=1:a=1[v][a]" -map [v] -map [a] output.mp4
  ffmpeg version 2023-08-28-git-b5273c619d-full_build-www.username_1.dev Copyright (c) 2000-2023 the FFmpeg developers
    built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
    configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-dxva2 --enable-d3d11va --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
    libavutil      58. 17.100 / 58. 17.100
    libavcodec     60. 23.100 / 60. 23.100
    libavformat    60. 10.101 / 60. 10.101
    libavdevice    60.  2.101 / 60.  2.101
    libavfilter     9. 11.100 /  9. 11.100
    libswscale      7.  3.100 /  7.  3.100
    libswresample   4. 11.100 /  4. 11.100
    libpostproc    57.  2.100 / 57.  2.100
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video1.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      creation_time   : 2021-10-08T12:31:56.000000Z
    Duration: 00:03:15.51, start: 0.000000, bitrate: 464 kb/s
    Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m, progressive), 1444x876 [SAR 1:1 DAR 361:219], 335 kb/s, 30 fps, 30 tbr, 30k tbn (default)
      Metadata:
        creation_time   : 2021-10-08T12:31:56.000000Z
        handler_name    : Mainconcept MP4 Video Media Handler
        vendor_id       : [0][0][0][0]
        encoder         : AVC Coding
    Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
      Metadata:
        creation_time   : 2021-10-08T12:31:56.000000Z
        handler_name    : Mainconcept MP4 Sound Media Handler
        vendor_id       : [0][0][0][0]
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'video2.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      creation_time   : 2023-02-28T15:42:03.000000Z
    Duration: 00:03:00.70, start: 0.000000, bitrate: 518 kb/s
    Stream #1:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m, progressive), 1796x970 [SAR 1:1 DAR 898:485], 390 kb/s, 30 fps, 30 tbr, 30k tbn (default)
      Metadata:
        creation_time   : 2023-02-28T15:42:03.000000Z
        handler_name    : Mainconcept MP4 Video Media Handler
        vendor_id       : [0][0][0][0]
        encoder         : AVC Coding
    Stream #1:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
      Metadata:
        creation_time   : 2023-02-28T15:42:03.000000Z
        handler_name    : Mainconcept MP4 Sound Media Handler
        vendor_id       : [0][0][0][0]
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'video3.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      creation_time   : 2023-02-27T11:18:11.000000Z
    Duration: 00:03:00.67, start: 0.000000, bitrate: 589 kb/s
    Stream #2:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m, progressive), 1800x970 [SAR 1:1 DAR 180:97], 461 kb/s, 30 fps, 30 tbr, 30k tbn (default)
      Metadata:
        creation_time   : 2023-02-27T11:18:11.000000Z
        handler_name    : Mainconcept MP4 Video Media Handler
        vendor_id       : [0][0][0][0]
        encoder         : AVC Coding
    Stream #2:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
      Metadata:
        creation_time   : 2023-02-27T11:18:11.000000Z
        handler_name    : Mainconcept MP4 Sound Media Handler
        vendor_id       : [0][0][0][0]
  File 'output.mp4' already exists. Overwrite? [y/N] y
  Stream mapping:
    Stream #0:0 (h264) -> scale:default
    Stream #0:1 (aac) -> concat
    Stream #1:0 (h264) -> scale:default
    Stream #1:1 (aac) -> concat
    Stream #2:0 (h264) -> scale:default
    Stream #2:1 (aac) -> concat
    concat -> Stream #0:0 (libx264)
    concat -> Stream #0:1 (aac)
  Press [q] to stop, [?] for help
  [Parsed_concat_3 @ 000001c73586c800] Input link in0:v0 parameters (size 1024x553, SAR 248297:248320) do not match the corresponding output link in0:v0 parameters (949x576, SAR 69312:69277)
  [Parsed_concat_3 @ 000001c73586c800] Failed to configure output pad on Parsed_concat_3
  [fc#0 @ 000001c735837640] Error reinitializing filters!
  Failed to inject frame into filter network: Invalid argument
  Error while filtering: Invalid argument
  [Parsed_concat_3 @ 000001c73586b300] Input link in0:v0 parameters (size 1024x553, SAR 248297:248320) do not match the corresponding output link in0:v0 parameters (949x576, SAR 69312:69277)
  [Parsed_concat_3 @ 000001c73586b300] Failed to configure output pad on Parsed_concat_3
  [fc#0 @ 000001c735837640] Error reinitializing filters!
  Failed to inject frame into filter network: Invalid argument
  [Parsed_concat_3 @ 000001c73586c600] Input link in0:v0 parameters (size 1024x553, SAR 248297:248320) do not match the corresponding output link in0:v0 parameters (949x576, SAR 69312:69277)
  [Parsed_concat_3 @ 000001c73586c600] Failed to configure output pad on Parsed_concat_3
  [fc#0 @ 000001c735837640] Error reinitializing filters!
  Failed to inject frame into filter network: Invalid argument
  [Parsed_concat_3 @ 000001c73586ce00] Input link in0:v0 parameters (size 1024x553, SAR 248297:248320) do not match the corresponding output link in0:v0 parameters (949x576, SAR 69312:69277)
  [Parsed_concat_3 @ 000001c73586ce00] Failed to configure output pad on Parsed_concat_3
  [fc#0 @ 000001c735837640] Error reinitializing filters!
  Failed to inject frame into filter network: Invalid argument
  [out#0/mp4 @ 000001c73710c900] Nothing was written into output file, because at least one of its streams received no packets. frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=N/A bitrate=N/A speed=N/A
  Conversion failed!
  
  ```
  
  The solution provided to this problem in [this question](https://video.stackexchange.com/questions/25136/ffmpeg-concat-problem) partially solves the problem, as the second concatenated video has no audio (the first one does), but I still can't figure out how to extend the solution to 3 or more videos.
  Anyone know how to help me?
  
  **Tags:** ffmpeg, concatenation
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2023-08-30. Score: 1 | Accepted answer
  
  You're setting `force_original_aspect_ratio` to `1` (`decrease`) so the videos can't be assumed to be the same resolution after scale. You'll need to pad the video to a common resolution and then reset the SAR.
  
  So,
  
  ```
  scale=1024:576:force_original_aspect_ratio=1
  
  ```
  
  should become
  
  ```
  scale=1024:576:force_original_aspect_ratio=decrease,pad=1024:576:-1:-1,setsar=1
  
  ```
  
  > **Comments:**
  > **username_0**: Thanks a lot, now it works  
  
  ---
  
  