Re: [FFmpeg-user] Video recording date with ffprobe

[Carl Eugen Hoyos]

Am Fr., 11. Dez. 2020 um 15:35 Uhr schrieb Mar Andrés López
:

> But I want the time in which the video was recorded, should it be in the 
> video metadata?

That depends on the encoder, FFmpeg considers this time private information and
does no write it to output files.

Carl Eugen
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Re: [FFmpeg-user] Public FFmpeg Docker images built with GitHub Actions

[Ryan Williams]

Wow, I'd missed https://hub.docker.com/r/jrottenberg/ffmpeg /
https://github.com/jrottenberg/ffmpeg somehow, looks much more
polished+complete than what I've done, thanks for the pointer. I'll update
my docs to mention it.
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Re: [FFmpeg-user] Public FFmpeg Docker images built with GitHub Actions

[Carl Eugen Hoyos]

Am So., 13. Dez. 2020 um 19:33 Uhr schrieb Ryan Williams :
>
> Wow, I'd missed https://hub.docker.com/r/jrottenberg/ffmpeg /
> https://github.com/jrottenberg/ffmpeg somehow, looks much more
> polished+complete than what I've done, thanks for the pointer. I'll update
> my docs to mention it.

Sorry, my understanding of docker is limited:
Are you endorsing a binary that violates the copyright of the FFmpeg
developers?

Carl Eugen
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[FFmpeg-user] ffmpeg webpage/source for ffmpeg version Windows 32-bit

[pavel.lopa]

Hi.




On what website can I please download ffmpeg for Windows 32-bit?

""
 

Thanks in advance.





Pavel
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[FFmpeg-user] What does -write_xing 0 do?

[MediaMouth]

I've been testing the option -write_xing 0 so that Apple Music properly 
displays the durations on ffmpeg-generated mp3 files.

I'm aware of the option from this 7-year-old post: 
https://trac.ffmpeg.org/ticket/2697  which 
describes it as a solution to QuickTime displaying TRTs incorrectly.

The problem mp3 files I've been testing actually show proper TRTs in QuickTime, 
but not in Apple Music and ExifTool.

The -write_xing 0 option seems to be fixing it.  I'm curious what it's actually 
doing.
What was the issue to begin with / what problem is it solving?
Is it doing other things to the converted file that might be worth knowing 
about?  Any down sides to using it?


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Re: [FFmpeg-user] ffmpeg webpage/source for ffmpeg version Windows 32-bit

[Carl Zwanzig]

On 12/13/2020 4:23 PM, pavel.l...@seznam.cz wrote:

On what website can I please download ffmpeg for Windows 32-bit?


Did you do a web search for that? It'll turn up a few hits.

z!
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Re: [FFmpeg-user] Public FFmpeg Docker images built with GitHub Actions

[Carl Zwanzig]

On 12/13/2020 11:02 AM, Carl Eugen Hoyos wrote:

Are you endorsing a binary that violates the copyright of the FFmpeg
developers?


How does that violate any copyrights? Please don't make us guess. (Pointing 
to something is not itself an "endorsement".)


If some part of that/those build(s) are license violations, how should the 
creator cure that?  (If the license isn't violated, it's difficult to see 
how any copyrights would be.)


Later,

z!
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Re: [FFmpeg-user] Generate single MPEGTS HLS segment based on fragmented input data

[Lingjiang Fang]

On Fri, 11 Dec 2020 18:15:01 +0100
Jan Marlewski  wrote:

>Hi,
>
>the problem I want to describe is similar to "Generate individual
>HLS-compatible .ts segments on-demand by downloading as little bytes as
>possible from a remote input file" described here
>http://ffmpeg.org/pipermail/ffmpeg-user/2016-December/034513.html -
>unfortunately no answers there.
>
>Initial assumptions are:
>- need to provide streaming solution based on HLS-compatible MPEGTS
>segments
>- for now need to stream audio only (maybe audio+video in the future,
>so generic solution would be the best for me)
>- my data source is a group of WAV file segments, exactly 10 seconds
>each - if you take all WAV segments and concatenate them you will get
>a nice, seamless audio track (no glitches, gaps etc.)
>- the cost of retrieving each WAV segment from my storage is
>relatively high
>
>My approach:
>- create m3u8 index file before any segments are actually available,
>as I know how many segments I need to generate and I also know their
>duration
>- when a MPEGTS segment is requested, collect WAV data from storage and
>generate MPEGTS file using FFmpeg:
>
>For first segment:
>ffmpeg -i input_1.wav -acodec aac -output_ts_offset 0ms output_1.ts
>
>For second segment:
>ffmpeg -i input_2.wav -acodec aac -output_ts_offset 1ms output_2.ts
>
>etc...
>
>My problem:
>- generated segments are not exactly 10 seconds long
>- gaps can be heard between some audio segments (may this be caused by
>above issue?)

I think the problem was caused by separated encoding of independent
files, because of the padding and frame size requirement of encoder.

My suggestion is process all file at once, these links may help:
https://stackoverflow.com/questions/7333232/how-to-concatenate-two-mp4-files-using-ffmpeg
https://trac.ffmpeg.org/wiki/Concatenate

>
>Any ideas how to generate single MPEGTS segments that will not cause
>glitches during playback?
>
>I need to expose the data through web API written in ASP.NET C#. Any
>idea on how to solve this problem, even if it may not use FFmpeg at
>all, would be appreciated.
>
>Thanks,
>Jan
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--
Best regards,
Lingjiang Fang
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