| Problem | Solution | |---------|----------| | Output > 1MB despite -fs 1M | FFmpeg’s -fs is approximate. Lower bitrate further or reduce duration. | | No video after conversion | Ensure input has video stream. Some online tools corrupt 3GP. Use FFmpeg. | | Audio out of sync | Use -async 1 in FFmpeg. | | Can’t play on old Nokia | Use H.263 baseline profile (default in FFmpeg). Avoid MPEG-4 part 2. |
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– Remove letterboxing to encode only active pixels. | Problem | Solution | |---------|----------| | Output
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