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Forum Discussion
Most preferred way to stream to TV?
I have a ReadyNAS 104. I'd like to stream avi and mp4 files from it to my TV. They are both connected to the network. What's the most preferred way of doing that? I'm guessing one way of doing it i...
The point on frame rate is that the original is ~24 fps, and it is being raised to ~30. The conversion tool does this by repeating every 4th frame - 1,2,3,4,5,6,7,8... is turned into 1,2,3,4,4,5,6,7,8,8.... This is called a 5:4 pulldown. Then it is spending bits encoding the duplicated frames that didn't need to be created in the first place.
Using a pulldown causes smooth motion to become somewhat jerky - this is called "judder" - which you can often see if you look for it. (btw - If you aren't seeing it now, then don't start looking for it. Once you start noticing it you will find it very annoying. Kind of like floaters in your eyes.).
On muxing:
audio and video are captured, and then compressed. The compressed bits are carried in "elementary" streams - one for audio, and a second for video. These elementary streams are then assembled into the file container -> in this case FLV and MP4. That assembly process is called "muxing".
With this particular file, the two elementary streams are completely compatible with MP4. So all that really needs to be done is extract those streams from the FLV and reassemble them into an MP4. That is called remuxing.
Instead, your tool is extracting the AVC elementary stream from the FLV, decoding every picture, resizing each picture from 624x352 to 800x480, applying the 5:4 pulldown, re-encoding the modified picture sequence, creating a new elementary stream and putting that new AVC elementary stream into the MP4. All the steps in italics are unneeded work, and can hurt quality.
Using a pulldown causes smooth motion to become somewhat jerky - this is called "judder" - which you can often see if you look for it. (btw - If you aren't seeing it now, then don't start looking for it. Once you start noticing it you will find it very annoying. Kind of like floaters in your eyes.).
On muxing:
audio and video are captured, and then compressed. The compressed bits are carried in "elementary" streams - one for audio, and a second for video. These elementary streams are then assembled into the file container -> in this case FLV and MP4. That assembly process is called "muxing".
With this particular file, the two elementary streams are completely compatible with MP4. So all that really needs to be done is extract those streams from the FLV and reassemble them into an MP4. That is called remuxing.
Instead, your tool is extracting the AVC elementary stream from the FLV, decoding every picture, resizing each picture from 624x352 to 800x480, applying the 5:4 pulldown, re-encoding the modified picture sequence, creating a new elementary stream and putting that new AVC elementary stream into the MP4. All the steps in italics are unneeded work, and can hurt quality.
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