Hi Ronald On Thu, May 22, 2025 at 07:59:06AM -0400, Ronald S. Bultje wrote: > Hi, > > On Wed, May 21, 2025 at 9:34 AM Timothée < > timothee.informati...@regaud-chapuy.fr> wrote: > > > Hello, > > > > I am interested in expanding ffmpeg's capabilities to extract > > low-level data from video codecs. Specifically, I'd like to implement > > functionality that would allow exporting frame data, macroblock > > information, quantization tables, and similar codec-specific elements > > to binary files for further analysis. > > > > After searching through the documentation and existing features, I > > haven't found similar functionality, though I may have missed > > something. Has this been implemented before, or are there related > > features I should examine? > > > Some older codecs implement minor variants for this, e.g. grep > for AV_FRAME_DATA_MOTION_VECTORS, which attaches a frame's motion vectors > to the picture data. I believe there's an example app and possibly a filter > to overlay MVs on top of the video frame based on this concept. You could > extend this to cover other (macro)block info. There used to be a variant of > this for quant-tables also but I can't find it, maybe it was removed.
For motion vectors: ./ffplay -flags2 +export_mvs -i matrixbench_mpeg2.mpg -vf codecview=mv=pf+bf+bb For macroblock segmentation and type vissualization + also motion vectors: ffplay-3.4.13 -debug vis_mb_type matrixbench_mpeg2.mpg -vf codecview=mv=pf+bf+bb For QP vissualization + also motion vectors: ffplay-3.4.13 -debug vis_qp matrixbench_mpeg2.mpg -vf codecview=mv=pf+bf+bb For qp values dumped on the console ./ffplay -debug qp -i matrixbench_mpeg2.mpg [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB The real ebay dictionary, page 1 "Used only once" - "Some unspecified defect prevented a second use" "In good condition" - "Can be repaird by experienced expert" "As is" - "You wouldnt want it even if you were payed for it, if you knew ..."
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