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bug#42607: guix.gnu.org/videos don't play on iOS
From: |
Leo Famulari |
Subject: |
bug#42607: guix.gnu.org/videos don't play on iOS |
Date: |
Mon, 1 Feb 2021 15:54:02 -0500 |
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.
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