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Part of the issue with CPU-bottleneck is that CPU technology has been totally stagnant for the past 2 years! It should have doubled during that period, but it turns out the laptop I bought 2 years ago has a CPU twice stronger than a brand new laptop at the same price today.

If you made SVP for Mobile, then CPU performance would have doubled.

Yay, DASH Manifest now works. And yes, some videos are now only available in lower quality than they were previously. Video formats change all the time. So there are files I have locally that I don't want to replace.

Chainik, for downloading, since you're already using Python, you might as well use YouTube-dl's code which is in the Public Domain according to their license

https://github.com/rg3/youtube-dl

Now that works except those that give me access denied for the DASH Manifest. You can then download WebM video + 256kb AAC audio into a MKV container for some videos.

OK, after parsing the DASH Manifest, now it downloads the 256kb audio stream.

Both YTD Video Downloader and www.clipconverter.cc fail to download the best video format.

I looked at all the video streams one by one to see whether one would have been mis-interpreted and I definitely don't find that 256kb stream.

Complete YouTube Saver definitely downloads 256kb ACC at this URL

If you open the web page in your browser and search "itag=141", however, you don't find it. It seems like it's not available anymore, but still is if you know how to request it... Complete YouTube Downloader seems to be doing something fancy here. Any idea?

Edit:
http://stream-recorder.com/forum/some-n … b&

OK I got the 160kbps Opus stream successfully. I'm definitely not seeing 256kbps ACC (code 141), but I have codes 266 and 313 that aren't recognized.

Searching online, 266 is MOV video type which I had never seen before. What's up with Mov? Is it good or should I ignore it?

I found a good list of format codes here: in the source code of another downloader
https://github.com/rg3/youtube-dl/blob/ … youtube.py

Now all streams are properly identified but I still see no trace of a 256kbps AAC. Do you see what format code it has?

Oh, that's what FormatCode is! I'm only seeing 140 and 171 as recognized streams, and the 3 unrecognized streams are 249, 250 and 251.

So it looks like they downgraded AAC and Vorbis in favor of Opus which I'm ignoring so far.

Let's this this HD video
https://www.youtube.com/watch?v=Q3oItpVa9fs

The best quality audio I'm seeing is non-DASH 720p with 192kb AAC audio. Then, I see only 2 DASH audios, AAC and Vorbis, and they're both 128kb. Unless I'm missing something?

Opus Audio? Is that implemented yet, are there currently videos using that format?

Alright... now it can download only the audio stream and merge it back with the video. I saw that not only did they lower the video bitrates, but they also lowered the audio bitrates from 192kb to 128kb. That's very unfortunate. So for videos I downloaded before I want to keep, even the AAC audio may be higher than the new Vorbis audio, so I have to compare the bitrate as well.

If the remote Vorbis bitrate is no less than 20% lower than the local AAC bitrate, I download the audio stream and merge it with the local video.

Some videos have Vorbis audio available but I can't redownload them because my local MP4 is higher quality. I might have to add an option to redownload only the audio and muxe that Vorbis audio with the local video. However, that won't work if the videos aren't exactly the same length.

This version will download according to those rules
http://spiritualselftransformation.com/ … 2-beta.exe

If WebM is less than 35% smaller than MP4, download WebM.
Otherwise, download H264 with Vorbis audio into a MKV container.
If only H264 is available, download into a MP4.

There is also a mass-downloader and updater that scans your local files to detect whether a better version can be downloaded. It will only replace your local files if the online version is either higher resolution or considerably larger. For MP4 files, if the file size is similar, it will re-download it with Vorbis audio.

Comparing for the same resolution: apples with apples. Are there cases where I should take the non-DASH H264? For now I'm discarding that version. But I remember seeing a MP4 video with 128kbps in the DASH version and 192kbps in the non-DASH, and both were available for the same resolution.