danbooru

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evazion cb35bad237 media assets: fix incorrect frame counts for certain .webm files.

Fix calculating incorrect frame counts for certain .webm files. An
example is https://danbooru.donmai.us/media_assets/5968481.

Caused by ffmpeg printing multiple `frame= NNN` lines, and us taking the
first one instead of the last one:

    frame=    1 fps=0.0 q=-0.0 size=N/A time=00:00:00.08 bitrate=N/A speed=2.07x    
[null @ 0x56046ff4e440] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 321 >= 321
    [null @ 0x56046ff4e440] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 321 >= 321
    frame=  395 fps=0.0 q=-0.0 size=N/A time=00:00:06.66 bitrate=N/A speed=12.3x    
frame=  791 fps=759 q=-0.0 size=N/A time=00:00:13.26 bitrate=N/A speed=12.7x    
frame= 1193 fps=772 q=-0.0 size=N/A time=00:00:19.94 bitrate=N/A speed=12.9x    
frame= 1374 fps=780 q=-0.0 Lsize=N/A time=00:00:22.86 bitrate=N/A speed=  13x
    video:719kB audio:4288kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

2022-11-03 22:01:51 -05:00