some questions

[android]

some questions

1. I have old crt tv ,i wish to play movies and other media files stored in my memory card , but tv has only audio video wires ports is there any device or way to play memory card to old crt tv?

2. Will zip , rar ,7zip or any other compression formats compress more video files?

3. Average life span of solded ram chip?

4. video format profile and format level means? If I record video from my phone it records in
Format profile : Constrained Baseline
Format level : 2

[Attachment 73066 - Click to enlarge]

And if I download video from any site its mostly in
Format profile : Main
Format level : 3

[Attachment 73067 - Click to enlarge]


5. What is Encoding SW : Lavf57.56.101
Encoding SW and Lavf57.56.101 full form?
Some videos have Lavf57.56.101 and some don't have

[Attachment 73068 - Click to enlarge]
in MX player it says Encoding SW

and in mediainfo
It says writting application

[Attachment 73069 - Click to enlarge]

6. Mediainfo shows some video's audio track have Delay relative to video why that happens? how to prevent that? Is it big problem while editing videos or re encoding??

[Attachment 73070 - Click to enlarge]
And ms full form?

7. What is ffmpeg?

[jagabo]

You need a media player with composite video and analog audio output. Something like these:

https://www.amazon.com/Player-Full-HD-Digital-Support-Output/dp/B09CLTDR81/
https://www.amazon.com/Player-Support-Portable-Internal-External/dp/B0821BXX4P/

[DB83]

Some answers:

1. No


2. Video Compression still means that a compressed video should still play whereas zip, rar etc are data compressors - you can still put a video in to one of these but you can not play it until it has been un-compressed from the zip etc. It's like putting beans in a can and sealing the lid. You can not eat the beans until you open the can and pour out its contents.


3-7. Just let Google be your friend (or even do your own searching in these forums).

[blud7]

You can probably get a cheap TV and USB drive that will play everything for ~$100 instead of getting a media player that works.

[Bwaak]

For less than $30 you can buy a converter box that will convert ATSC into composite, but it will also play videos off a USB stick. It will also record onto USB stick.

[blud7]

No doubt. You'll get much more out of getting the TV though. Either way there are options.

[android]

There's a device called MP5 player used in cars? but not sure it will work with tv or not

And new tv is expensive and also some people says that old crt tv is best , modern tv will work for 4-5 years..

Believe it or not my crt tv is 20+ years old ,still its display is like new

[android]

Video Compression still means that a compressed video should still play whereas zip, rar etc are data compressors - you can still put a video in to one of these but you can not play it until it has been un-compressed from the zip etc. It's like putting beans in a can and sealing the lid. You can not eat the beans until you open the can and pour out its contents.

But is it worthy to pack videos in zip ,rar
I mean they will save to much space?

Video packed in zip and unpacked video will have much size difference?

recommended or not

[DB83]

Not.

Size difference is nominal (but will vary according to the compression setting and/or the container)


And when you come to unpack the zip, you will have both the zip file AND the video so practically taking twice as much disk space. ZIP and RAR are typically used for downloads so you delete the ZIP after the initial unpack.

[Bwaak]

Believe it or not my crt tv is 20+ years old ,still its display is like new

Believe it or not my plasma TV is 17 years old.

You can buy an LCD TV with the screen larger than your CRT for $150-$200.

[jagabo]

But is it worthy to pack videos in zip ,rar
I mean they will save to much space?

No. The last step in video and audio compression with high compression codecs like MPEG2, AVC, HEVC, etc. is entropy encoding -- very similar to that used in zip or rar files. So putting the files in a ZIP or RAR archive will not make them smaller.

[_Al_]

And new tv is expensive and also some people says that old crt tv is best , modern tv will work for 4-5 years..

Believe it or not my crt tv is 20+ years old ,still its display is like new

When you ditch CRT and get big screen, you start to realize how much content and details you have simply missed. Because CRT screen is so small (even smaller while watching 16:9 content) or you would not watch it from a couple of feet distance.

Decade or more ago I used WDTV Live to watch any HD content (camcorder content) on CRT, basically that was the sole purpose for me to have it. jagabo and others posted some other devices, but that is the way to go, you can tap even from a network. Not wdtv Live, that is outdated already.

[android]

So zip won't work?

And my crt tv screen size is around 20 to 25 inch, never measured ,tv came first ,i born later lol
I'll buy new tv when it will stop working..

Anyone check my 6th question and explain why it shows delay minus -7ms ,while playback it doesn't looks like it has audio delay
what causes delay?

[DB83]

Did you not bother to read my analogy of the difference between, for example, a mp4 and a mp4 'compressed' in a data (zip/rar etc) container. Go do it yourself. Try to play that, mp4, direct from the zip/rar container. Your player will, invariably, complain that the video is not in a supported format and 'invite' you to try and play it regardless. If that zip/rar has other files in it - they often do beit a password to uncompress etc - you fail. And even if there is minimal compression and your player can not parse that compression (and I guess that none can) your 'beans' will be 'stone cold'

The 'delay' is a natural relationship at encoding level between video and audio. That 'delay' must be echoed when you re-compress a file unless you demux both audio and video before re-compress. If you merely play the video do not fuzz your head with this.

[Alwyn]

Anyone check my 6th question and explain why it shows delay minus -7ms ,while playback it doesn't looks like it has audio delay
what causes delay?

That delay is equivalent to 0.2 of a frame (29.97*7/1000). Your ear-eye coordination isn't that good. You may notice a 50ms delay, and probably would notice a 100ms delay, but not 7ms, especially on a little CRT.

[android]

Ok i understood the zip files
and zipped video files can be played directly from zip files but if I click them, then it first copy to temp folder then plays..

But last doubt I have 1 zip file(downloaded from internet)
zip file has 20 jpg images
And zip file size it's size is 5,609,841 Bytes(5.35MB)
when I extract all those 20 jpgs to a blank folder
folder size becomes 5,608,019 bytes(5.35MB) few bytes lower then zip file ,extracted folder is low in size compared to folder packed in zip why?



Delay explaination didn't understood
I have a movie it has -7ms delay relative to video,
If I edit and cut some parts of movie ,exported clip audio will out of sync?

Let's say I do lossless cut which won't do re encoding so with lossless cut exported clip will have same -7ms delay or no delay or audio out of sync?

And if I don't use lossless cut and re encode clip while exporting then exported clip will have -7ms delay or no delay or audio out of sync?

[Alwyn]

Delay explaination didn't understood
I have a movie it has -7ms delay relative to video,

I say again. You will not notice the delay. It's too small. Just ignore it and edit as you wish.

[jagabo]

But last doubt I have 1 zip file(downloaded from internet)
zip file has 20 jpg images
And zip file size it's size is 5,609,841 Bytes(5.35MB)
when I extract all those 20 jpgs to a blank folder
folder size becomes 5,608,019 bytes(5.35MB) few bytes lower then zip file ,extracted folder is low in size compared to folder packed in zip why?

Because JPG images are already compressed with a ZIP like algorithm. They can't easily be compressed any more. So when you ZIP them up you get the overhead of a zip file in addition to the JPG images. It's like zipping up a zip file. It gets bigger, not smaller.

[android]

If there is not noticeable delay then I'll ignore ,if there is to much delay after edit then I'll post again..

Thank you everyone

[Alwyn]

Thinking about it some more, I'm no expert on this but I suspect that the delay value is for the player to apply, so that the audio will be in sync when you play the file. I don't think it means that there will be a 7ms delay when you play it.

[jagabo]

Thinking about it some more, I'm no expert on this but I suspect that the delay value is for the player to apply, so that the audio will be in sync when you play the file. I don't think it means that there will be a 7ms delay when you play it.

Of course it's a delay for the player to apply. 7ms is negligible. You won't be able to detect it one way or another. But some A/V files may have several seconds delay (or advance). In cases like that you need to compensate for the delay when you re-encode.

[hello_hello]

Thinking about it some more, I'm no expert on this but I suspect that the delay value is for the player to apply, so that the audio will be in sync when you play the file. I don't think it means that there will be a 7ms delay when you play it.

Lossy audio is stored in "frames" or small chunks. When a file is split, only a whole audio chunk can be removed, which is one possible reason for a very small delay (added to compensate).
If the source is an MKV it can't have a negative delay, even though MediaInfo reports it as negative, as MediaInfo just displays an audio delay relative to the video. In reality, the video might have a +7ms delay while the audio has none, or the video delay might be 54ms and the audio delay 47ms etc. For MKVs, you can check what's really going on by looking at the info gMKVExtractGUI displays when you open an MKV.

[android]

Hi ,sometimes video in zip file can be played directly..i am using Xplore application for android by lonely cat games and zarchiver both has option to play video directly without uncompression...

Does it directly put video from zip files to ram and play?

[jagabo]

Does it directly put video from zip files to ram and play?

Yes, it decompresses on-the-fly into DRAM while playing.

But, once again, for modern codecs this is useless as the video and audio compression temselves uses the same type of entropy encoding that ZIP, RAR, 7Z, etc. use.

[android]

Yes, it decompresses on-the-fly into DRAM while playing.

Means more stress on processor while video playback not good for weak processors

[Cornucopia]

Decompressing zip type entropy coding is quick and easy compared to motion estimated gop reconstruction & deconvolution. Weak processors are weak/slow for lots of things at that point, but zip files are not structured with realtime media playback in mind, so it is counterproductive to use that form on top of existing codecs.


Scott

[android]

zip files are not structured with realtime media playback

I guess If there's a movie (approx 2hour) in zip file and played directly from zip file and seeked to 1hour position then it will uncomress and load all data first (not sure about this)

But if movie is in x264 avc type format then it will just load data from nearest keyframe