[FFmpeg-user] Problem with videos not playing in mobile browser

[Paul B Mahol]

On Tue, Jun 28, 2022 at 3:44 PM Dr Mark A. Garlick <magarlick2 at gmail.com>
wrote:

> Dear all
>
> I am new to this forum.
>
> I have noticed that some of my videos, encoded with ffmpeg and uploaded
> to my websites, do not play on mobile web browsers, but they work
> perfectly well on desktop browsers on my Linux machine. I get either a
> message saying 'file is corrupted' or no message at all (just a blank
> video) depending on the browser. I've tried Brave, Firefox and Chrome,
> on an iPhone, a Samsung tablet and a Samsung Galaxy s10 plus. The 'bad'
> videos consistently fail to play on mobile devices.
>
> I've run an ffprobe on two .mp4 files: one which works on a mobile and
> desktop browser (good.mp4) and one which will only play on a desktop
> browser (bad.mp4. These are partial outputs (the rest of the output for
> the two files seems identical):
>
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bad.mp4':
>    Metadata:
>      major_brand     : isom
>      minor_version   : 512
>      compatible_brands: isomiso2avc1mp41
>      encoder         : Lavf58.76.100
>    Duration: 00:00:30.02, start: 0.000000, bitrate: 1582 kb/s
>    Stream #0:0(und): Video: h264 (High 4:2:2) (avc1 / 0x31637661),
> yuv422p10le(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 1574 kb/s, 24 fps,
> 24 tbr, 12288 tbn, 48 tbc (default)
>      Metadata:
>        handler_name    : VideoHandler
>        vendor_id       : [0][0][0][0]
>    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
> stereo, fltp, 2 kb/s (default)
>      Metadata:
>        handler_name    : SoundHandler
>        vendor_id       : [0][0][0][0]
>
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'good.mp4':
>    Metadata:
>      major_brand     : isom
>      minor_version   : 512
>      compatible_brands: isomiso2avc1mp41
>      encoder         : Lavf58.76.100
>    Duration: 00:00:30.00, start: 0.000000, bitrate: 4824 kb/s
>    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
> bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 4821 kb/s, 24
> fps, 24 tbr, 12288 tbn, 48 tbc (default)
>      Metadata:
>        handler_name    : VideoHandler
>        vendor_id       : [0][0][0][0]
>
> The command I used to encode them both (via a bash scrip on Linux) is
>
> for f in *.mp4
>      do ffmpeg -i "$f"  -vf "drawtext=text='© Mark A. Garlick /
> markgarlick.com':x=w-tw-10:y=10:
> fontfile=/usr/share/fonts/truetype/msttcorefonts/Trebuchet_MS.ttf:fontsize=25:fontcolor=white"
>
> -write_tmcd false -s 1280x720 -preset medium -crf 24 "full/${f%.*}.mp4"
> done
>
> Can anybody offer any insight?
>

probably YUV420P vs YUV422P

Some players only supports YUV420P.


>
> My thanks.
>
> --
> Dr Mark A. Garlick      *Dr Mark A. Garlick
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