Transcode Video to Avid Meridien Using FFmpeg

This article provides a practical guide on how to transcode video files into the legacy Avid Meridien codec using FFmpeg. You will learn the exact command-line arguments needed to output both Meridien Compressed and Meridien Uncompressed formats, ensuring compatibility with older Avid editing systems and archive workflows.

Understanding Avid Meridien in FFmpeg

Avid Meridien is a legacy, standard-definition (SD) codec family used primarily in older Avid Media Composer and Symphony systems. Because Avid Meridien is not a standalone open-source codec, FFmpeg achieves compatibility by utilizing standard codecs (like MJPEG or Raw Video) wrapped in a QuickTime (.mov) container, combined with specific Avid FourCC identifying tags.

There are two primary forms of Avid Meridien: 1. Avid Meridien Compressed: Based on Motion JPEG (MJPEG) technology. 2. Avid Meridien Uncompressed: Based on raw, uncompressed 2vuy 8-bit 4:2:2 video.

Method 1: Transcoding to Avid Meridien Compressed (AVdj)

To create a Meridien Compressed file, use the FFmpeg mjpeg encoder and force the FourCC tag to AVdj. Because Meridien is a standard-definition format, you must also scale the video to SD resolutions (720x486 for NTSC or 720x576 for PAL).

For NTSC (29.97 fps):

ffmpeg -i input.mp4 -vf "scale=720:486,fps=29.97" -c:v mjpeg -pix_fmt yuvj422p -vtag AVdj -b:v 20M -c:a pcm_s16le -ar 48000 output.mov

For PAL (25 fps):

ffmpeg -i input.mp4 -vf "scale=720:576,fps=25" -c:v mjpeg -pix_fmt yuvj422p -vtag AVdj -b:v 20M -c:a pcm_s16le -ar 48000 output.mov

Command Breakdown: * -vf "scale=720:486,fps=29.97": Scales the video to NTSC Meridien standard resolution and sets the frame rate. * -c:v mjpeg: Uses the Motion JPEG video encoder. * -pix_fmt yuvj422p: Sets the pixel format to YUV 4:2:2, which matches Meridien’s color sampling. * -vtag AVdj: Overrides the default QuickTime tag with the Avid Meridien Compressed identifier. * -b:v 20M: Sets the video bitrate (adjust this value depending on the target Meridien ratio, e.g., 2:1, 3:1, or 10:1). * -c:a pcm_s16le -ar 48000: Converts the audio to 16-bit PCM at 48kHz, the native standard for Avid systems.

Method 2: Transcoding to Avid Meridien Uncompressed (AVui)

For maximum quality, you can transcode to Avid Meridien Uncompressed. This format uses uncompressed raw video wrapped in a QuickTime container with the AVui tag.

For NTSC (29.97 fps):

ffmpeg -i input.mp4 -vf "scale=720:486,fps=29.97" -c:v rawvideo -pix_fmt uyvy422 -vtag AVui -c:a pcm_s16le -ar 48000 output.mov

For PAL (25 fps):

ffmpeg -i input.mp4 -vf "scale=720:576,fps=25" -c:v rawvideo -pix_fmt uyvy422 -vtag AVui -c:a pcm_s16le -ar 48000 output.mov

Command Breakdown: * -c:v rawvideo: Disables compression to output raw video frames. * -pix_fmt uyvy422: Specifies the 8-bit YUV 4:2:2 pixel format required for uncompressed Meridien. * -vtag AVui: Overrides the QuickTime metadata tag to identify the file as Avid Meridien Uncompressed.