Open Video Converter Guide: Batch Conversion, Presets, and Troubleshooting

Open Video Converter Guide: Batch Conversion, Presets, and Troubleshooting

Batch conversion — quick steps

1. Add files: Drag-and-drop multiple videos or use File > Add Folder.
2. Select output folder: Choose a single destination so all converted files appear together.
3. Choose a preset or format: Pick a preset (e.g., MP4 — H.264, Web/YouTube, iPhone) or set container + codec manually.
4. Apply settings to all: Use “Apply to all” or select all items and assign the same preset to process uniformly.
5. Adjust per-file options (optional): If needed, tweak resolution, bitrate, or audio track per item before starting.
6. Enable hardware acceleration: Turn on GPU/Intel/NVIDIA acceleration in Preferences for faster batch runs (if supported).
7. Start queue: Click Start/Encode and monitor progress in the queue pane. Pause/resume if needed.

Best presets to use (recommendations)

• General compatibility: MP4 (H.264) + AAC audio — good balance of size and device support.
• High-quality archive: MKV (H.265/HEVC) + lossless/high-bitrate audio — smaller files at high quality (ensure playback support).
• Small file / web: MP4 (H.264) with CRF 23–28 or lower bitrate (e.g., 1–3 Mbps) for 1080p.
• Mobile devices: Use device-targeted presets (iPhone/Android) that match resolution and codec.
• Audio-only: MP3 or AAC export from video for podcasts/music.

Preset settings to check

• Codec: H.264/H.265/VP9/AV1 depending on compatibility and quality needs.
• Container: MP4 for broad compatibility, MKV for advanced features.
• Resolution / scaling: Keep source resolution unless reducing size; enable “Maintain aspect ratio.”
• Frame rate: Preserve source FPS unless you need to standardize (e.g., 30 fps).
• Bitrate / quality: Use CRF for constant-quality (18–23 for high quality H.264); or set target bitrate for predictable sizes.
• Audio: Sample rate 44.⁄₄₈ kHz, AAC 128–256 kbps for stereo.
• Subtitles / tracks: Embed or burn subtitles; select correct audio track/language.

Common troubleshooting & fixes

• Failed conversions / errors
  • Update to the latest version; install required codecs.
  • Try switching container (e.g., MKV → MP4) or change codec.
  • For corrupted sources, remux first (no re-encode) or try repairing with ffmpeg:

    Code
    Copy CodeCopied
    ffmpeg -i broken.mp4 -c copy repaired.mp4 

• Poor quality after conversion
  • Use a lower CRF number (e.g., 18–20) or increase target bitrate.
  • Ensure you’re not upscaling small sources—scale down instead.
  • Use two-pass encoding for consistent bitrate-targeted output.
• Audio desync
  • Preserve original frame rate; re-mux audio and video separately, then rejoin.
  • Try forcing a specific audio codec/sample rate (e.g., AAC 48 kHz).
  • If source has variable frame rate (VFR), convert to constant frame rate (CFR) during encode.
• Long conversion times
  • Enable hardware acceleration (GPU/Intel/AMD) if available.
  • Batch smaller groups in parallel only if CPU/GPU can handle concurrency.
  • Reduce output resolution or increase CRF slightly to speed encode.
• Subtitles not showing
  • For softsubs, ensure player supports the container/subtitle format.
  • To force visibility, burn subtitles into the video during encode.
• Unsupported format on target device
  • Use device-specific preset (e.g., iPhone H.264 baseline/main) or convert to MP4/H.264 + AAC.

Advanced tips

• Use watch-folder/queue automation or CLI (ffmpeg) for repeated batch jobs.
• Create custom presets for recurring exports (resolution, bitrate, audio) and save them.
• Test with one file before running large batches.
• Keep originals until conversions are verified.

If you want, I can produce:

• a short ffmpeg batch script for automated conversion, or
• three custom presets (small web, mobile, archive) with exact settings — tell me which one to create.