On Wed, Jul 29, 2020 at 07:26:57PM -0400, Leo Famulari wrote: > > nginx can easily sniff iOS/Macintosh user agents and serve them an inferior > > format to match, such as h264 with MP3 audio, which can both be encoded > > using free software in Guix. > > Here is where the videos are created: > > https://git.savannah.gnu.org/cgit/guix/videos.git/tree/Makefile > > ------ > $(NUMBER).clino.$(VIDEO).webm: \ > $(VIDEO)/$(LOCALE_LANG)/durations.txt \ > $(VIDEO)/$(LOCALE_LANG)/audios/all.mp3 > ffmpeg -y -f concat -vsync cfr \ > -i $(VIDEO)/$(LOCALE_LANG)/durations.txt \ > -i $(VIDEO)/$(LOCALE_LANG)/audios/all.mp3 \ > -c:a libopus -b:a 192k \ > -c:v libvpx-vp9 -crf 31 -b:v 0 -pix_fmt yuv420p \ > -af apad -shortest \ > -vf fps=25 -threads 4 $(VIDEO)/$(LOCALE_LANG)/videos/$@; > make clean_noCli > ------ > > So, we'd need to add a target that did "-c:a copy -c:v libx264" and add > some logic to create two videos instead of one. I didn't look into it > closely yet to see if that will be simple or not. Coming back to this, I don't remember why I suggested "c:a copy". We would want to transcode the audio as well, because the standard codec is h264/aac.