Re: can't play av1 codec video

On Mon, 29 Nov 2021 09:49:50 -0500
The Wanderer <[email protected]> wrote:

> On 2021-11-27 at 22:00, Masaru Nomiya wrote:
> 
> > Hello,
> > 
> > I tried to play av1 codec file, but no video;
> > 
> > MPlayer 1.2.r38327-7 (C) 2000-2021 MPlayer Team  
> 
> > [lavf] stream 1: audio (aac), -aid 0, -alang eng
> > LAVF: 1 audio and 1 video streams found
> > LAVF: build 3820644
> > VIDEO:  [av01]  1280x720  24bpp  29.970 fps  567.9 kbps (69.3
> > kbyte/s) [V] filefmt:44  fourcc:0x31307661  size:1280x720
> > fps:29.970  ftime:=0.0334  
> 
> > Cannot find codec matching selected -vo and video format
> > 0x31307661.  
> 
> This is the problem: the version of MPlayer, FFmpeg, etc., being used
> was not compiled with a codec that recognizes this video-format
> identifier, or knows how to play it.
> 
> This hexadecimal value corresponds to the four-character
> video-format-identifier code ("fourcc") '10va'. Reading this
> backwards, you get 'av01', which Google tells me is the AV1 video
> codec.
> 
> > I tested with the file which I got from;
> > 
> > https://youtu.be/feSVtC1BSeQ
> > 
> > But, vlc, ffplay, xine-lib, and kodi can play this flawlessly,  
> 
> When I download that URL with youtube-dl, by default it gives me a
> file which has a video stream with the fourcc '462H', which read
> backwards is 'H264', or the H.264 video codec.

Yes, I too had to work a little bit to find an av1 rather than h264
encoded video.

> My local copy of MPlayer (compiled from SVN, and from FFmpeg git,
> about a month ago) is able to recognize the AV1 codec, and play the
> file without issues.
> 
> I haven't done an exhaustive investigation, but the little digging
> I've done so far seems to indicate that this AV1 support is being
> provided via FFmpeg by libaom, which I have installed (on Debian) via
> the libaom3 and libaom-dev packages.

Yes.  On Fedora, after reading this, I found the distro installed
mplayer worked because I had  the libaom package installed.  Probably
also why vlc, ffplay, and totem worked.  But, my locally compiled svn
version didn't work because the libaom development package wasn't
installed. I installed it and compiled again, and 'Bingo!, we have a
winner!'.

Thanks for resolving this problem.

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