> -----Original Message----- > From: Eoff, Ullysses A > Sent: Tuesday, July 09, 2019 6:45 PM > To: ffmpeg-devel@ffmpeg.org > Cc: Eoff, Ullysses A <ullysses.a.e...@intel.com> > Subject: [PATCH] avfilter: add rawdump filter > > This filter enables raw frames to be dumped to a > file before they are sent through the auto-inserted > scaler filter and useful when you want unscaled > raw frames in an output file. >
The primary goal that I'm trying to achieve here is dump raw "unscaled" yuv to an output file while decoding a multi-resolution video. Unfortunately, the ffmpeg utility auto-inserts a scaler into the filter graph, so -f rawvideo doesn't suffice here since the decoded data passes through the scaler before it's handed off to the rawvideo filter. I experimented with the alternative methods suggested in earlier feedback. More specifically, "reinit_filter" and "split" were suggested. For "split" filter, I couldn't find a way that it could bypass the auto-inserted scaler. Although -reinit_filter 0 works in some cases, it is quite verbose. And I have found many other cases where it doesn't work when we need to specify additional filters (e.g. hwupload, hwdownload when doing qsv or vaapi accelerated decoding with hw output formats). So, afaict, this patch is the only reliable method I can find to intercept the decoded data before it reaches the scaler for various use-cases (although the patch still needs a little bit of work as pointed out in previous replies). For added context, my organizations team and I contribute to both msdk/qsv and vaapi plugins for ffmpeg and gstreamer development. The idea is we want a way to validate that direct decoder output is an exact bitmatch across every decoder solution that we contribute to (to provide a better and more consistent end-user experience regardless of end-user choice). But since ffmpeg auto-inserts this "scaler" and not all scaling algo's are equal, it poses a challenge to verify. Regards, U. Artie _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
