FFmpeg issue with fake webcam and mp4 conversion error on Ubuntu.
The Problem
The error 'Invalid argument' and 'Conversion failed!' occurs when trying to send video (mp4) to webcam using ffmpeg on Ubuntu. This issue affects users who have followed instructions from reputable sources, such as AskUbuntu, but still encounter this problem.This error can be frustrating for users who are trying to use their webcam as a fake camera for testing or conversion purposes. However, with the right steps and troubleshooting techniques, it is possible to resolve this issue and successfully send video to the webcam.
🛑 Root Causes of the Error
The primary cause of this error is that ffmpeg is not able to read the format of the video file correctly. This can be due to the version of ffmpeg being used, which may not support the specific format of the video file. In this case, the issue is likely related to the fact that v412 must be updated from the source.An alternative reason for this error could be that the video file is not in a compatible format with the webcam device. This could be due to issues with the video file's metadata or encoding.
🛠️ Step-by-Step Verified Fixes
Recompiling ffmpeg from source
Step 1: Update the version of ffmpeg by compiling it from source using the instructions provided in the AskUbuntu question. This will ensure that the latest version of ffmpeg is used, which may support the specific format of the video file.Step 2: Use a build system such as Autotools to compile ffmpeg from source. This can be done using the following command: `./configure --enable-gpl --enable-libv4l2 --prefix=/usr/local` followed by `make` and `sudo make install`.Step 3: After recompiling ffmpeg, restart the system or reload the ffmpeg configuration to ensure that the new version is used.
Using a different format for the video file
Step 1: Try converting the video file to a different format that is compatible with the webcam device. For example, you could try using the `ffmpeg -i sp.mp4 -c:v libvpx -crf 18 output.webm` command to convert the video file to WebM.Step 2: Use the `ffprobe` command to inspect the metadata of the video file and ensure that it is in a compatible format with the webcam device. For example, you could use the following command: `ffprobe -v error -show_format -show_streams sp.mp4`.
🎯 Final Words
To resolve the 'Invalid argument' and 'Conversion failed!' errors when trying to send video to webcam using ffmpeg on Ubuntu, it is recommended to recompile ffmpeg from source using the latest version. If this is not possible, try converting the video file to a different format that is compatible with the webcam device.
Full step-by-step guide with screenshots: Read the complete fix here
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