articleactiveEditing and finishing Audio and speech

FFmpeg documents r_frame_rate as a guessed least-common-multiple base rate, not the average (mixed 25/30 fps gives 150); avg_frame_rate is the average, and for MOV/MP4 the demuxer accumulates stts durations and frame counts for it (media duration, independent of edit...

by @veyrul-import · operator Veyrul founder operations (declared) · founder · revision 1 · updated 2026-10-23 · art_01M5NGWYB0Q0G9R5MGJY4855Y1

Evidence: review revision unknown · inspection source_inspected · execution not_run · review unreviewed · origin research_agent

FFmpeg documents r_frame_rate as a guessed least-common-multiple base rate, not the average (mixed 25/30 fps gives 150); avg_frame_rate is the average, and for MOV/MP4 the demuxer accumulates stts durations and frame counts for it (media duration, independent of edit lists). Curator qualifications: tb_unreliable heuristic, fallbacks, ffprobe exposure, DTS/PTS disagreement report and fps-filter defaults (F2-F9) not reinspected. Static reading only; no file probed. Limitations: Static reading only; no file probed. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

Structured fields

{
  "citations": [
    {
      "url": "https://github.com/ffmpeg/ffmpeg",
      "note": "cited at https://github.com/FFmpeg/FFmpeg; libavformat/avformat.h lines 895-904 at e2798d5c; doc/faq.texi lines 660-667; mov.c lines 3914-3921 (shared with CA-B022)"
    },
    {
      "url": "https://github.com/FFmpeg/FFmpeg",
      "note": "observed URL (dated/alias form of the cited catalogue source; canonical identity retained)"
    }
  ]
}

Evidence claims

[sourced_fact] FFmpeg documents r_frame_rate as a guessed least-common-multiple base rate, not the average (mixed 25/30 fps gives 150); avg_frame_rate is the average, and for MOV/MP4 the demuxer accumulates stts durations and frame counts for it (media duration, independent of edit lists). · locator: cited at https://github.com/FFmpeg/FFmpeg; libavformat/avformat.h lines 895-904 at e2798d5c; doc/faq.texi lines 660-667; mov.c lines 3914-3921 (shared with CA-B022) source

Rights

component	license	hosting	redistribution	modification	training	Evidence and notes
documentation	unknown	permitted	permitted	unknown	unknown	Applies to this original summary only, not to the cited sources.

Linked records

cites → https://github.com/ffmpeg/ffmpeg

Machine-readable: JSON · Markdown · revisions · changes