Convert CAVS to DV — Free Online Tool
Convert CAVS (Chinese Audio Video Standard) files to DV format, re-encoding the video stream to the dvvideo intra-frame DCT codec and the audio to uncompressed PCM 16-bit little-endian. This conversion is useful for ingesting Chinese broadcast-origin footage into DV-native editing workflows and legacy camcorder-compatible pipelines.
to
FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your CAVS file here
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Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
CAVS files use a Chinese national standard video codec (similar in architecture to H.264 but independently developed) with AAC audio. DV is a fixed-bitrate, intra-frame format originally designed for camcorders, where every frame is compressed independently using DCT — no inter-frame prediction. This conversion requires a full video transcode: FFmpeg decodes each CAVS frame and re-encodes it using the dvvideo codec, which imposes strict constraints on resolution (typically 720x480 for NTSC or 720x576 for PAL), frame rate, and chroma subsampling (4:1:1 for NTSC DV, 4:2:0 for PAL DV). The AAC audio track is transcoded to PCM signed 16-bit little-endian (pcm_s16le), which is lossless uncompressed audio and a requirement of the DV container. Because DV uses intra-frame compression, the output file will generally be significantly larger than the CAVS source.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary, the open-source multimedia processing engine that handles CAVS decoding, video re-encoding via dvvideo, and audio transcoding to PCM — all running here via FFmpeg.wasm in your browser. |
-i input.cavs
|
Specifies the input file in CAVS (Chinese Audio Video Standard) format. FFmpeg reads and demuxes the CAVS container, routing the video stream to its CAVS decoder and the AAC audio stream to its AAC decoder. |
-c:v dvvideo
|
Instructs FFmpeg to encode the output video stream using the dvvideo codec, which implements the intra-frame DCT compression used by the DV standard. This is a full re-encode from CAVS — no stream copying is possible since CAVS and DV use entirely different codecs. |
-c:a pcm_s16le
|
Transcodes the AAC audio from the CAVS source into signed 16-bit little-endian PCM, the uncompressed audio format required by the DV container. This produces lossless-quality audio output (from the decoded AAC signal) at a fixed bit depth of 16 bits. |
output.dv
|
Defines the output file as a .dv file — the standard file-based container for DV video. FFmpeg uses the .dv extension to select the DV muxer, which wraps the dvvideo and pcm_s16le streams into the flat DV bitstream format compatible with DV editing tools and hardware. |
Common Use Cases
- Ingesting Chinese broadcast footage (originally encoded in CAVS) into legacy video editing suites like Final Cut Pro 7 or Avid Media Composer that natively handle DV streams
- Preparing CAVS-sourced archival video for playback or digitization workflows involving DV tape decks or hardware DV interfaces
- Converting Chinese digital terrestrial or satellite broadcast recordings to DV for compatibility with broadcast ingest systems built around the DV standard
- Migrating CAVS clips into a DV-based project in a nonlinear editor where format consistency across the timeline is required
- Testing or quality-checking CAVS-origin content through a DV signal chain before final broadcast or distribution output
Frequently Asked Questions
Yes, some quality loss is inevitable because both the decode of CAVS and the re-encode to dvvideo are lossy processes. Additionally, DV enforces strict resolution constraints (720x480 or 720x576) and specific chroma subsampling, so if your CAVS source has a different resolution or aspect ratio, FFmpeg will scale and potentially crop or letterbox the image. DV's fixed ~25 Mbps bitrate is high enough to preserve good visual quality for standard-definition content, but any source footage that was HD will be downscaled.
CAVS, like H.264, uses inter-frame compression — frames share data with neighboring frames, making it very storage-efficient. DV uses intra-frame compression only, meaning every single frame is fully encoded independently at a fixed bitrate of approximately 25 Mbps. This intra-frame approach dramatically increases file size compared to a temporally compressed CAVS file of similar duration. The uncompressed PCM audio also contributes slightly more than the original AAC audio would.
No. The DV container does not support subtitles, chapters, or rich metadata tracks, and the CAVS format itself also lacks these features. Any embedded text, timing cues, or structured metadata in the source file will not be carried over to the DV output. If your CAVS file has associated subtitle files, you will need to handle them separately outside of this conversion.
DV has two standard profiles: NTSC at 720x480 and 29.97 fps, and PAL at 720x576 and 25 fps. If your CAVS source already matches one of these resolutions and frame rates, the transcode will be straightforward with minimal scaling artifacts. If the source is at a different resolution (such as 1280x720 or 1920x1080), FFmpeg will scale it down to fit DV constraints, which will soften fine detail. Frame rate mismatches may also require frame rate conversion, which can introduce motion judder.
Yes. On Linux or macOS, you can loop over files with a shell command such as: for f in *.cavs; do ffmpeg -i "$f" -c:v dvvideo -c:a pcm_s16le "${f%.cavs}.dv"; done. On Windows, a similar loop can be written in PowerShell or a batch script. This is particularly useful for converting large collections of CAVS broadcast recordings where the browser-based tool's 1GB per-file limit might be a constraint.
For DV video, there are no quality tuning parameters — dvvideo always encodes at a fixed bitrate determined by the DV standard, so flags like -crf or -b:v have no effect. For audio, pcm_s16le is uncompressed and also has no bitrate parameter; it always outputs at full 16-bit PCM quality. The only meaningful adjustments you can make are resolution scaling (using -vf scale=) or frame rate conversion (using -r) to control which DV profile the output targets.
Technical Notes
The dvvideo codec in FFmpeg is strict about input parameters: it requires the pixel format to be yuv411p for NTSC DV or yuv420p for PAL DV, and the resolution must match the DV standard exactly. FFmpeg will attempt to handle these constraints automatically, but unusual source resolutions or pixel formats from the CAVS file may require explicit filter flags like -vf scale=720:480,format=yuv411p to avoid encoding errors. The CAVS format uses its own entropy coding and intra/inter prediction mechanisms distinct from H.264, so FFmpeg's CAVS decoder is invoked for demuxing and decoding before the dvvideo encoder takes over. Because DV supports only a single audio track in standard stereo (or mono) PCM at 48 kHz or 32 kHz, any multi-channel audio in the source will be downmixed. The DV container is a flat binary stream format with minimal metadata capacity — there is no support for embedded thumbnails, extended tags, or cover art. File durations and basic stream information are retained, but rich descriptive metadata from the CAVS source is discarded.