Заметки фронтендера

https://github.com/chubin/cheat.sh
example:

➜  ~ cht.sh webm to mp4
/*
 * As your input file report a strange frame rate value `1k fps` coming
 * from the tbs and tbr value (look [here for their definition][1])
 *
 * the encoder generate a different result, `16k tbn, 1k tbc (default)`
 *
 * So by calling :
 */

 ffmpeg -fflags +genpts -i 1.webm -r 24 1.mp4

/*
 * You configure ffmpeg to generate new pts (a.k.a Presentation
 * TimeStamp) for each frame and you set the target frame-rate to 24.
 *
 * So your output mp4 file info (`ffmpeg -i ....`) change from
 */

 Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 4327 kb/s, 1000.09 fps, 1k tbr, 16k tbn, 2k tbc

/* to */

 Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1670 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc

/*
 *   [1]: https://stackoverflow.com/questions/3199489/meaning-of-ffmpeg-
 * output-tbc-tbn-tbr
 *
 * [alexbuisson] [so/q/18123376] [cc by-sa 3.0]
 */
➜  ~

GitHub

GitHub - chubin/cheat.sh: the only cheat sheet you need

the only cheat sheet you need. Contribute to chubin/cheat.sh development by creating an account on GitHub.

www.tgoop.com/node_modules/99

224 viewsedited  Jul 30, 2023 at 22:22

https://github.com/chubin/cheat.sh
example:

➜  ~ cht.sh webm to mp4
/*
 * As your input file report a strange frame rate value `1k fps` coming
 * from the tbs and tbr value (look [here for their definition][1])
 *
 * the encoder generate a different result, `16k tbn, 1k tbc (default)`
 *
 * So by calling :
 */

 ffmpeg -fflags +genpts -i 1.webm -r 24 1.mp4

/*
 * You configure ffmpeg to generate new pts (a.k.a Presentation
 * TimeStamp) for each frame and you set the target frame-rate to 24.
 *
 * So your output mp4 file info (`ffmpeg -i ....`) change from
 */

 Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 4327 kb/s, 1000.09 fps, 1k tbr, 16k tbn, 2k tbc

/* to */

 Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1670 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc

/*
 *   [1]: https://stackoverflow.com/questions/3199489/meaning-of-ffmpeg-
 * output-tbc-tbn-tbr
 *
 * [alexbuisson] [so/q/18123376] [cc by-sa 3.0]
 */
➜  ~

BY Заметки фронтендера