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Browser testing via 
Downloading random files from the internet often results in container mismatches (where an .avi header is put on an H.263 stream incorrectly). The most robust way to get an H.263 sample is to generate one yourself.
It takes 30 seconds if you have FFmpeg installed. Open your terminal and run: h 263 video sample download better
ffmpeg -i input_video.mp4 -c:v h263 -s 352x288 -an output_h263.3gp
Why this is the "better" approach:
Play the sample frame-by-frame using VirtualDub2 (with the H.263 plugin) or MPV. Look for: Downloading random files from the internet often results
If you are looking for H.263 video samples (.3gp, .avi, or .mp4 with H.263 codec) for testing, debugging, or educational purposes, here are the best sources and recommended files. Why this is the "better" approach: Play the
Goal: A large set of H.263 clips at multiple bitrates with ground truth. Better download:
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