Set bitrate limits for transcoding (fixes #638) (#1135)

* Set bitrate limits for transcoding (fixes #638)

* added optimization script and test, changed stuff

* fix test, improve docs

* re-add optimize-old-videos script

* added documentation

* Don't optimize videos without valid UUID, or redundancy videos

* move getUUIDFromFilename

* fix tests?

* update torrent and file size, some more fixes/improvements

* use higher bitrate for high fps video, adjust bitrates

* add test video

* don't throw error if resolution is undefined

* generate test fixture on the fly

* use random noise video for bitrate test, add promise

* shorten test video to avoid timeout

* use existing function to optimize video

* various fixes

* increase test timeout

* limit test fixture size, add link

* test fixes

* add await

* more test fixes, add -b:v parameter

* replace ffmpeg wiki link

* fix ffmpeg params

* fix unit test

* add test fixture to .gitgnore

* add video transcoding fps model

* add missing file

1 files changed, 11 insertions, 0 deletions

diff --git a/support/doc/tools.md b/support/doc/tools.md
index 1db29edc0..8efb0c13d 100644
--- a/support/doc/tools.md
+++ b/support/doc/tools.md
@@ -187,6 +187,17 @@ To delete them (a confirmation will be demanded first):
 $ sudo -u peertube NODE_CONFIG_DIR=/var/www/peertube/config NODE_ENV=production npm run prune-storage
 ```
 
+### optimize-old-videos.js
+
+Before version v1.0.0-beta.16, Peertube did not specify a bitrate for the transcoding of uploaded videos.
+This means that videos might be encoded into very large files that are too large for streaming. This script
+re-transcodes these videos so that they can be watched properly, even on slow connections.
+
+```
+$ sudo -u peertube NODE_CONFIG_DIR=/var/www/peertube/config NODE_ENV=production npm run optimize-old-videos
+```
+
+
 ### update-host.js
 
 If you started PeerTube with a domain, and then changed it you will have invalid torrent files and invalid URLs in your database.