[mythtv-users] Problems when streaming from a web site

Scott Simpson simpson1000 at live.com
Sun Nov 6 16:32:12 UTC 2022


On 11/6/2022 9:46 AM, Stephen Worthington wrote:
> On Sun, 6 Nov 2022 08:39:17 -0500, you wrote:
>> On 11/5/2022 10:02 PM, Stephen Worthington wrote:
>>> On Sat, 5 Nov 2022 21:03:24 -0400, you wrote:
>>>> The external tuner uses this ffmpeg command on reading:
>>>>
>>>> [RECORDER]
>>>> command="ffmpeg -hide_banner -nostats -loglevel fatal -re -i %URL% -c:v
>>>> copy -c:a copy -f mpegts -"
>>>
>> 1.mythcommflag --rebuild -f %FILE%
>> Didn't work. Now when I skip ahead it says 0 length and doesn't work.
> 
> Did mythcommflag produce any warning or error messages?

Just this. Don't know if it is a concern.

mythtv at mythtv:/mythtv/recordings$ mythcommflag --rebuild -f 
36114_20221105103000.ts
2022-11-06 10:26:16.512971 C  mythcommflag version: fixes/32 
[v32.0+fixes.202211050719.18f5b48ee1~ubuntu22.04.1] www.mythtv.org
2022-11-06 10:26:16.512986 C  Qt version: compile: 5.15.3, runtime: 5.15.3
MythTV Commercial Flagger, building seek table for:
     Stacey David's GearZ - Upgrading the Yellow Van
Rebuild started at Sun Nov 6 10:26:18 2022
2022-11-06 10:26:25.803436 E  VideoProfile: No window!
2022-11-06 10:26:25.803987 E  VideoProfile: No window!
2022-11-06 10:26:25.892378 E  VideoProfile: No window!
2022-11-06 10:26:25.892751 E  VideoProfile: No window!
2022-11-06 10:26:47.659031 E  decoding error End of file (-541478725)
Rebuild completed at Sun Nov 6 10:26:47 2022
mythtv at mythtv:/mythtv/recordings$


>> On 11/5/2022 10:02 PM, Stephen Worthington wrote:
>>> On Sat, 5 Nov 2022 21:03:24 -0400, you wrote:
>> 2. ffmpeg -i xxxx.ts -c copy t.ts
>> Didn't make any difference
> 
> Every time you change the recording file, you have to run mythcommflag
> --rebuild again before you try playing the file.  The skip data made
> from the old file will definitely not work with the new file.

Tried that. No difference. Still can't seek ahead. Sees length as zero 
as before.

>> On 11/5/2022 10:02 PM, Stephen Worthington wrote:
>>> On Sat, 5 Nov 2022 21:03:24 -0400, you wrote:
>> 3. initial multiplexing as an MKV work better than an MPEG transport stream
>> Not sure how to do this.
> 
> I have never done this, but I think you just have to tell ffmpeg to
> produce a .mkv output file, instead of .ts.  So try changing "-f
> mpegts" to "-f mkv".  The rest of the recorder setup should also be

I tried this and got a recorder failure. Doesn't like just changing the 
mpegts to mkv.

On 11/6/2022 8:49 AM, Peter Bennett wrote:
 > I suggest encode to h264 and aac using:
 >
 > -c:v libx264 -preset veryfast -crf 21  -c:a aac
 >
 > I use crf 21 for 720p, 23 for 1080p and 22 for 480p
 >
 > CPU usage is higher, but I have had perfect results and no skipping
 > problems. You can see my entire set of scripts here:

This actually works and solves my skip problems. It creates smaller 
files too since I used 21 (720p) and the video comes in as 1080p. 
However, it seems to not record the last 7 minutes or so. I don't know 
why. It pegs the CPU as expected but that isn't a concern of mine.

Your Github repository for using FireTV is impressive. I'm not using it 
now but I might. I have a FireTV at home.

If I can't solve the "convert to libx264" truncation problem I'll have 
to keep recording without being able to skip ahead. Truncating is worse 
than not being able to skip.


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