https://forum.videohelp.com/ Everything about video conversion from AVI, DivX, XVID, FLV, ASF, MPG, MOV, RM, MP4, MKV, MP4, OGM, WMV,AVCHD, HDV, DV, MJPEG, Huffyuv, MPEG2, MTS, M2TS,etc to any video format. Also demultiplexing, multiplexing, video repairing issues. en Wed, 14 Oct 2026 03:56:58 GMT vBulletin 60 https://forum.videohelp.com/images/misc/rss.png https://forum.videohelp.com/ https://forum.videohelp.com/threads/421203-Writing-library-in-Mediainfo?goto=newpost Wed, 30 Sep 2026 12:05:32 GMT Hi, Two video files are analyzed by Mediainfo (https://www.videohelp.com/software/MediaInfo). One has Writing library = x264 core 164 r3094 bfc87b7 The other has Writing library = x264 core 164 r3190 7ed753b What’s the key difference between the both while playing them? Hi,

Two video files are analyzed by Mediainfo.

One has Writing library = x264 core 164 r3094 bfc87b7
The other has Writing library = x264 core 164 r3190 7ed753b

What’s the key difference between the both while playing them? ]]> Video Conversion blanc https://forum.videohelp.com/threads/421203-Writing-library-in-Mediainfo https://forum.videohelp.com/threads/421197-accelerate-ffmpeg?goto=newpost Tue, 29 Sep 2026 12:04:14 GMT Hi, my computer converts a large mp4 file very slowly: ffmpeg (https://www.videohelp.com/software/ffmpeg) –i old.mp4 new.mp4 How can I accelerate this? Maybe split it into two parts and start two conversions at the same time? Hi,

my computer converts a large mp4 file very slowly: ffmpeg –i old.mp4 new.mp4

How can I accelerate this? Maybe split it into two parts and start two conversions at the same time? ]]> Video Conversion blanc https://forum.videohelp.com/threads/421197-accelerate-ffmpeg https://forum.videohelp.com/threads/421181-Video-too-large-for-screen?goto=newpost Fri, 25 Sep 2026 13:25:22 GMT Hi, something's wrong with my video settings, and I can't figure out what. The output from the video player is larger than the screen, so to speak, and I cannot figure out what to do about it. The screen is 4:3, I run Windows 10 and the player is MPC-HC, PotPlayer, Kmplayer, VLC and others. I use Avidemux for editing videos and occasionally VirtualDub.

I am grateful for any and all help with this.

[Attachment 93898 - Click to enlarge] ]]> Video Conversion Kokopelli https://forum.videohelp.com/threads/421181-Video-too-large-for-screen https://forum.videohelp.com/threads/421170-convert-smv?goto=newpost Wed, 23 Sep 2026 17:11:06 GMT Sujet : Need help decoding an old Smith Micro "VideoLink Mail" .SMV webcam video (1990s)
Hi everyone,
I have an old webcam video recorded with Smith Micro VideoLink Mail software (probably late 1990s), saved as a .smv file. The software is long discontinued and I can't find a working copy or player.
What I've found so far:
The file starts with embedded resource strings referencing "VideoLink Mail" (error messages, etc.)
FFmpeg detects a raw H.263 video stream inside (176x144, ~25fps) starting a few KB into the file
Extracting and decoding that stream with FFmpeg produces heavily corrupted/garbled frames — mostly colored noise blocks, not a real image
It's possible the video is interleaved with audio or extra framing bytes I'm not accounting for
Does anyone recognize this format, have a working copy of VideoLink Mail (Windows 98/XP era), or know how the container structures the H.263 payload? Any pointers appreciated — happy to share a hex dump or the file itself if useful. ]]> Video Conversion bigerniel https://forum.videohelp.com/threads/421170-convert-smv https://forum.videohelp.com/threads/421160-CrunchyGUI-MacOS-FFmpeg-front-end?goto=newpost Mon, 21 Sep 2026 12:20:38 GMT CrunchyGUI v1.4.0 (https://files.videohelp.com/u/26273/CrunchyGUI_v1.4.0.zip) Bug Fixes: -Resolved failed jobs for truncated audio headers (malformed/corrupt headers). -Added queue highlight color for failed jobs and full log option in options. -Added filter customization - users can tweak... CrunchyGUI v1.4.0

Bug Fixes:
-Resolved failed jobs for truncated audio headers (malformed/corrupt headers).
-Added queue highlight color for failed jobs and full log option in options.
-Added filter customization - users can tweak filter defaults as needed per job
-Tested encoding on stock 2.35 aspect 1080P on an M2 Mac Studio @ 800 fps (no filters) using HEVC and VideoToolBox..

Download a pre-compiled FFmpeg here: https://ffmpeg.martin-riedl.de
They have links for both FFmpeg and FFprobe. FFprobe is optional but suggested.

CrunchyGUI is a native macOS app for video conversion, remuxing, audio processing, subtitles, metadata editing, and batch encoding, powered by FFmpeg. Based on the current source and README, its features include:
Video encoding and formats
- MP4 and MKV output.
- Software encoding with SVT-AV1, H.264/x264, and H.265/x265.
- Apple VideoToolbox hardware encoding for H.264 and HEVC.
- Video stream copying for remuxing without re-encoding.
- Quality, speed presets, frame-rate adjustment, keyframe intervals, and hardware-specific controls.
- Codec-specific advanced arguments and a live effective-settings preview.
Color and picture adjustments
- Automatic detection of source color metadata, bit depth, and HDR/SDR.
- Preserve source color, convert HDR to SDR, or manually configure color handling.
- Six tone-mapping algorithms, including Hable, Reinhard, and Mobius.
- Interactive color analysis with frame previews and hue, saturation, brightness, contrast, and gamma adjustments.
- Compare source interpretations, step through nearby frames, and confirm or discard adjustments.
Cropping and resizing
- Automatic letterbox detection using fast distributed samples or thorough every-frame analysis.
- Manual crop overrides with visible edge measurements.
- Keep cropped source size, fix width or height, specify exact dimensions, or fit within bounds.
- Common resolution presets, aspect-ratio locking, optional upscaling, and sample-aspect-ratio correction.
- Bicubic, Lanczos, and Spline36 scaling.
Noise reduction and sharpening
- Up to four noise-reduction passes and four sharpening passes.
- HQDN3D, Wavelet, NLMeans, and BM3D denoising.
- CAS, LapSharp, and Unsharp sharpening.
- Individual filter presets and detailed customization for supported filters.
- Performance warnings for expensive filter combinations.
Audio
- Up to four independently configured output tracks, using embedded or external audio.
- Stream copy or conversion to AAC, AC-3, E-AC3, or Opus.
- Channel layouts from mono through 7.1, including Dolby Pro Logic II downmixing.
- Bitrate, sample-rate, track-title, and default-track controls.
- Streaming, film, and custom loudness normalization, including two-pass analysis and optional pre-scanning.
- Export and convert, or raw extract of audio files from source
Subtitles and chapters
- Embedded and external subtitle selection, language tags, default tracks, conversion, and burn-in.
- Automatic selection based on the Mac’s language.
- Selectable bitmap/PGS subtitles in MKV; burn-in for MP4.
- Import, edit, add, remove, restore, or generate chapters at regular intervals.
- Export and convert, or raw extract of subtitle files and chapters from source to common formats.
Metadata and artwork
- Source metadata import and online lookup through TMDB and TheTVDB.
- Editable titles, sorting, media kind, descriptions, genre, release date, ratings, studio, composer, and artwork.
- Poster importing, removal, and aspect-ratio cropping.
- Metadata-only saving to a new file or replacement of the original without re-encoding media.
- Validated native metadata updates for supported MP4-family files; stream-copy remuxing for MKV.
Batch processing and queues
- Reusable JSON templates and per-tab template settings.
- Batch import from selected files or folders, optionally including subfolders.
- Per-file source inspection and language/channel-based track matching.
- Queue reordering, saving, editing, pause/resume, cancellation, and cleanup.
- Historical jobs can be loaded as new jobs; import warnings remain accessible.
Workflow and monitoring
- Short sample encodes with configurable start time and duration.
- Progress, rolling FPS, elapsed time, and ETA.
- Saved PLIST projects and preferences.
- Automatic filename cleanup and collision numbering.
- Optional custom Finder thumbnails.
- FFmpeg selection, build inspection, thread overrides, contextual help, and optional debug logging.
- Metadata-service credentials stored in macOS Keychain.
FFmpeg and FFprobe must be installed separately, with support for the selected encoders and filters. ]]> Video Conversion DJRumpy https://forum.videohelp.com/threads/421160-CrunchyGUI-MacOS-FFmpeg-front-end https://forum.videohelp.com/threads/421159-VideoMetricsLab-An-advanced-video-quality-comparison-tool?goto=newpost Mon, 21 Sep 2026 10:02:44 GMT VideoMetricsLab - Calculate VMAF and VMAF NEG on NVIDIA GPUs, and SSIMULACRA2, Butteraugli and ColorVideo VDP on NVIDIA, AMD and Intel GPUs, alongside PSNR, SSIM and XPSNR. Compare encodes with frame-exact playback that switches between the source and each encode instantly.

Here's an app I wrote to analyze video quality between different encodes. This was inspired by FFMetrics, but I wanted many more features for comparisons, like advanced statistics and an ability to easily and instantly subjectively A/B compare encoded videos with the source. This makes subjective video quality comparisons so much easier when you can compare on a frame by frame basis and while the video is playing, and instantly switch to the source or a different encoded video.

So I decided to write my own app, and I'd like to share it with all of you. I hope you all enjoy

Let me know what you think, have any issues, or have feature requests.

Features:

- Calculate VMAF, VMAF NEG, PSNR, SSIM, XPSNR, SSIMULACRA2, Butteraugli, and ColorVideo VDP for multiple test videos.
- Vship integration for GPU acceleration for ColorVideo VDP, SSIMULACRA2, and Butteraugli, on NVIDIA (CUDA), AMD (HIP) and any other GPU with a Vulkan driver
- GPU acceleration for VMAF v0.6.1 and VMAF NEG on NVIDIA GPUs (GeForce GTX 16 and RTX 20 series or newer), with a bundled libvmaf built with CUDA
- libjxl integration for CPU fallback for SSIMULACRA2, and Butteraugli (no CPU support for ColorVideo VDP)
- VMAF v0.6.1 and v1 models for standard, phone, 4K, and HFR viewing scenarios.
- Compare metric curves, statistics, and per-frame scores (per second for ColorVideo VDP).
- Switch instantly between the source and test videos during playback, hold **S** to show the source, or inspect exact frames.
- Inspect bitrate independently by frame, second, or GOP.
- Detect black bars and handle resolution mismatches automatically.
- Use GPU decoding with independent software fallback per input.
- Calculate two test videos in parallel on many-core CPUs.
- Auto save completed results and auto load results when matching videos are loaded again.









The app can be downloaded below.

https://github.com/4KVCD/VideoMetricsLab/releases ]]> Video Conversion 4KVCD https://forum.videohelp.com/threads/421159-VideoMetricsLab-An-advanced-video-quality-comparison-tool https://forum.videohelp.com/threads/421150-Can-DeVeDENG-Convert-Two-Different-File-Types?goto=newpost Sat, 19 Sep 2026 14:58:30 GMT Hi! I have some video files I want to burn to a dvd disk. There are 8 files in all---it's a mini-series. Seven are .wav and one is .mp4. Can I do this just by adding all the files at once to DeVeDeNG, or do I have to convert the ,mp4 file to .wav first? I'll be using a double-sided disk, so they will fit. Any and all responses will be greatly appreciated. Thanks. ]]> Video Conversion Blakes7 https://forum.videohelp.com/threads/421150-Can-DeVeDENG-Convert-Two-Different-File-Types https://forum.videohelp.com/threads/421145-HERO11-Black-LRV-(moov-atom-missing)-untrunc-reconstructs-container-but?goto=newpost Fri, 18 Sep 2026 11:45:11 GMT Camera: GoPro HERO11 Black. Firmware: H22.01.02.30.00. Camera serial (from file header): C3471324558318.

Problem: A recording lost its moov atom (classic "moov atom not found" - the file has ftyp + a single huge mdat, no index). The file is 7,207,669,851 bytes (7.2 GB), currently named f25799168.LRV (renamed during export/download, so I can't confirm the original GoPro filename/chapter number). No SD card or other copy exists - this is the only copy.

What I've confirmed so far: Right after the mdat header, there's ~1600 bytes of GoPro's proprietary session-info block ("GPRO" magic, firmware string, camera serial, then strings like HERO11 Black / NATURAL / STANDARD / STEREO / REAL_SPEED / PERFORMANCE / MANUAL / NO_LIMIT etc.) before any actual codec data starts.

Using a working reference file from the SAME camera (a normal chaptered GX010051.MP4, HEVC/hvc1, 3840x2160, 29.97fps, tracks: gpmd+hvc1+tmcd, no audio), I confirmed via untrunc that the broken file is also HEVC (Main profile), and by manually parsing an HEVC SPS NAL found inside the broken file's own mdat (not from the reference's moov), the real resolution checks out as 3840x2160 too - so this isn't a low-res proxy encode, it's full 4K, despite the .LRV extension.

I sampled Shannon entropy at 16 different offsets spread across the entire 7.2 GB (every ~500MB) - entropy is ~7.99-8.0 bits/byte everywhere, no zero-filled or repeating regions anywhere in the file. The payload data itself appears fully intact end to end; only the index is missing. Estimated real duration from bitrate (~94 Mbps, matching the reference file's bitrate) and file size: roughly 10 minutes.

What I tried (untrunc, anthwlock/untrunc fork, built from source on macOS against ffmpeg 9.0.1):

- "untrunc -s -sm ref.mp4 broken.LRV" (with the real camera reference above) completes and reports "Found 18935 packets (gpmd: 836 hvc1: 18098 hvc1-keyframes: 565 tmcd: 1)", i.e. it looks like it recovered the whole ~10 minutes with 565 keyframes.

- In reality, only the very first frame (an IDR right after the GPRO header block, ~offset 1607 into mdat) decodes cleanly in ffmpeg/VLC-style decoding. Every frame after that fails with a consistent pattern of HEVC decode errors: "PPS id out of range: 242", "SPS 2 does not exist", "PPS changed between slices", later "Could not find ref with POC N" / "First slice in a frame missing".

- Tried: default step size (already 1 byte, i.e. finest possible scan), -k (keep unknown sequences), -dcc (don't check chunks inside mdat), -dr (dump raw tracks), forcing ffmpeg to decode through errors (-max_error_rate 1.0, single-threaded). None of these get past frame 1 - either identical frozen output (error concealment repeating frame 1) or a hard decoder abort somewhere in the first ~100-200MB.

- Tried a synthetic H.264 reference and a synthetic HEVC reference (ffmpeg-generated, no real GoPro structure) first, before I had a real reference file - those failed immediately with 0 keyframes found, so I don't think this is a resolution/profile mismatch problem; it looks like untrunc's generic byte-stepping heuristic (-s) just can't reliably re-sync to real sample boundaries within GoPro's interleaved gpmd/hvc1/tmcd chunk layout after the first GOP, even at 1-byte step granularity.

What I'm hoping someone can help with:

1) Does anyone know the actual byte-level interleaving pattern GoPro uses in mdat for HERO11 Black HEVC recordings (chunk header/marker bytes, fixed chunk sizes or alignment, order of gpmd/hvc1/tmcd samples) that would let a tool correctly walk sample boundaries without relying on stsz/stco from a healthy moov?

2) Is there a GoPro-specific fork/patch of untrunc, or another tool, that specifically handles this interleaving (rather than the generic byte-stepping "-s" fallback)?

3) Any recommendation for a data-recovery service that has actually dealt with this exact GoPro HEVC mdat structure successfully?

Happy to share the untrunc build, logs, or any additional byte-offset dumps if that helps someone dig in. The payload data is confirmed intact for the full 7.2 GB, so I believe this is fully recoverable in principle - I just don't have the tooling to nail the per-sample framing beyond frame 1. ]]> Video Conversion Wendelin https://forum.videohelp.com/threads/421145-HERO11-Black-LRV-(moov-atom-missing)-untrunc-reconstructs-container-but