This is https://nyaa.si/view/1214773 with the container changed to mp4, since it took forever to seek in the flv video.
No re-encoding was done, audio and video are kept the same as in flv.
Literally a
```
ffmpeg -i 'hololive 1st Fes.flv' -c:v copy -c:a copy 'hololive 1st Fes.mp4'
```
Video info:
```
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'hololive 1st Fes.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 02:54:48.64, start: 0.000000, bitrate: 2709 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 2536 kb/s, 59.02 fps, 59 tbr, 16k tbn, 118 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 160 kb/s (default)
Metadata:
handler_name : SoundHandler
```
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