New answers tagged youtube
The two major platforms that YouTube video players use are Adobe Flash, and Adobe Air. Flash 11 only supports 2 channel audio. Adobe air 3 supports multichannel audio. Also HTML5 supports multi channel audio. most multichannel streams will be PCM no bit stream, as you need licensing from Dolby or DTS to encode/decode. Furthermore multi channel audio is only ...
A common method is split-and-stitch where the file is cut into pieces and sent to multiple servers for transcode. That way you can transcode a file of any length in a fixed amount of time. Telestreams Episode Engine can do this, but I'm sure Google uses something custom coded.
Youtube will encode the primary or default audio stream. Youtube doesn't support multiple audio streams. Neither does Vimeo. Although, apparently, some videos like the 2012 Olympic streams did have it. Special handling by Youtube, I'm sure.
Looks like Handbrake is outputting full range but flagging it as video levels, so the Handbrake output actually has Y=0 as black and Y=255 as white but the flag is telling Youtube that Y=16 is black and Y=235 is white. If you upload a short segment (3-5s) of both your Handbrake input and output, that can be confirmed.
Take a look at Blender or Lightworks (both free). You can import footage and add text or shapes (simple one with Lightworks) to it.
A custom video resolution has no bearing on quality here; only the choice of encoder, bitrate/rate factor and other parameters will impact the final result. Youtube's player frame on its site is always 16:9, so if your video has an aspect ratio other than 16:9, YT will automatically add black bars as necessary. No need for the uploader to do so. However, if ...
On Avid ProTools when you are working on a video with an audio track, there are some hotkeys to automatically select all the audio parts where the waveform goes to zero or near to it. Extending the selection also to the video track and cutting it off as well should do the trick, then you have just to use another hotkey to join the cutted pieces together ...
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