| Symptom | Likely Cause | Fix | |---------|--------------|-----| | | Audio codec not supported by player | Use VLC (has built‑in codecs) or convert with FFmpeg ( -c:a aac ). | | Video plays but is jerky | Low frame‑rate or high bitrate for the device | Convert to a lower bitrate ( -b:v 1500k ) or resize ( -vf scale=1280:-2 ). | | File won’t open in Windows Media Player | Missing 3GP codec | Install K‑Lite Codec Pack or use VLC instead. | | Converted MP4 is larger than original | Re‑encoding at higher bitrate | Use -crf 23‑28 for H.264 or keep -c copy if codecs already compatible. | | File corrupted after download | Incomplete transfer | Re‑download using a stable connection; verify file size matches source. |
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