[FFmpeg-user] Tricks for fragmented mp4

[andrei ka]

wget -O - -o /dev/null
http://wycutters.wyscout.com/box/argentina/velez_test_g1234567.mp4 |
ffprobe.new -i -

On Mon, Mar 2, 2020 at 4:01 PM Gabriele Greco <gabrielegreco at gmail.com>
wrote:

> Hi guys,
>
> there is a way to probe a fragmented mp4 available through FTP faster? The
> operation is almost instant on a local file, while it takes almost 1 minute
> with a very good internet connection.
>
> This test file is a 3 hours video file made with ffmpeg in fragmented mode,
> every fragment is 1 min length, so there are 180 fragments.
>
> ffprobe reads every fragment doing a range http request, using the grep and
> wc I saw that there are 183 http requests in total.
>
> Reducing the number of fragments is not an option since sadly the file
> should be playable almost realtime with a moderate delay (and 1 min is
> already enough)
>
> the version of ffprobe is HEAD, here is the complete console output, the
> test file should be public to everyone:
>
> time ../ffmpeg-head/ffprobe
> http://wycutters.wyscout.com/box/argentina/velez_test_g1234567.mp4
> ffprobe version N-96711-gdd81f73946 Copyright (c) 2007-2020 the FFmpeg
> developers
>   built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
>   configuration: --disable-videotoolbox --disable-audiotoolbox
> --enable-libx264 --enable-libfdk-aac --enable-nonfree --enable-gpl
>   libavutil      56. 39.100 / 56. 39.100
>   libavcodec     58. 68.100 / 58. 68.100
>   libavformat    58. 38.100 / 58. 38.100
>   libavdevice    58.  9.103 / 58.  9.103
>   libavfilter     7. 75.100 /  7. 75.100
>   libswscale      5.  6.100 /  5.  6.100
>   libswresample   3.  6.100 /  3.  6.100
>   libpostproc    55.  6.100 / 55.  6.100
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '
> http://wycutters.wyscout.com/box/argentina/velez_test_g1234567.mp4':
>   Metadata:
>     major_brand     : isom
>     minor_version   : 512
>     compatible_brands: isomiso2avc1iso6mp41
>     artist          : 171
>     encoder         : Lavf58.20.100
>     genre           : fast
>   Duration: 03:00:00.03, start: 0.000000, bitrate: 6265 kb/s
>     Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661),
> yuvj420p(pc, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 6132 kb/s, 24.97 fps,
> 59.94 tbr, 12800 tbn, 50 tbc (default)
>     Metadata:
>       handler_name    : VideoHandler
>     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
> stereo, fltp, 127 kb/s (default)
>     Metadata:
>       handler_name    : SoundHandler
>
> real 1m2.094s
> user 0m0.206s
> sys 0m0.169s
>
> Trace of the content-range calls:
>
> ffprobe -v trace
> http://wycutters.wyscout.com/box/argentina/velez_test_g1234567.mp4 2>&1 |
> grep Content-Range
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 0-8458597672/8458597673'
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 46834645-8458597672/8458597673'
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 93336173-8458597672/8458597673'
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 140460071-8458597672/8458597673'
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 187703091-8458597672/8458597673'
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 234834646-8458597672/8458597673'
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 281564338-8458597672/8458597673'
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 328890982-8458597672/8458597673'
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 375821706-8458597672/8458597673'
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 422895067-8458597672/8458597673'
> [... total of 183 calls, included the one I've not cut ... ]
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 8458590761-8458597672/8458597673'
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 40154-8458597672/8458597673'
> [http @ 0x55a4d8addaa0] header='Content-Range: bytes
> 45874897-8458597672/8458597673'
>
> --
> Bye,
>  Gabry
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