ffmpeg -i HNTV-004.mp4 -c copy repaired_HNTV-004.mp4
Sometimes a file is renamed to .mp4 but contains a different format (e.g., .mkv or .flv ). Use a tool like MediaInfo (free, cross-platform). It will reveal the actual video and audio codecs. HNTV-004 Mp4HNTV-004 Mp4
Just got my hands on – has anyone else seen this one yet? ffmpeg -i HNTV-004