[FFmpeg-user] How to transcode to HLS and DASH with mp4 and webm all at once

[Robin van der Linden]

Hello Stefan,

did you received the mail I directly send you?


Kind regards,

Robin

Am 2022-10-12 14:00, schrieb Stefan Oltmanns:
> Hi Alvaro,
> 
>> you should be able to generate the mpd file for DASH
> 
> Yes, but how? ffmpeg proved an easy way to generate 
> webm-dash-manifests,
> but I cannot figure out how to use it to include the MPEG segments.
> 
> And MPEG-DASH manifest creation afterwards I couldn't figure out at 
> all,
> only with at least remuxing the files.
> 
> Best regards
> Stefan
> 
> 
> Am 12.10.22 um 10:47 schrieb Alvaro Jimenez:
>> DASH is codec agnostic, so if you already have or generate the ts 
>> segments for HLS, you should be able to generate the mpd file for DASH 
>> to play back the same segments you would use for HLS. I have used the 
>> m4s segments, and I have seen a common instance of lip sync issues 
>> that I have never see using mpeg.ts segments. In my opinion, CMAF 
>> using mp4 segments is over-rated, and heavily promoted by commercial 
>> encoding and streaming engines like Wowza.
>> Regards,
>> Alvaro Jiménez
>> 
>> 
>> On Tuesday 11 October 2022 10:06:36 AM (-07:00), Stefan Oltmanns 
>> wrote:
>> 
>>> Hi Clay,
>>> 
>>> for me storage is not a major concern (the total number of videos 
>>> will
>>> not be that high), but device compatibility is (including older
>>> devices). Apple does not seem to support CMAF on older devices, only
>>> MPEG-TS, therefore I'll stick to MPEG-TS. There are also some 
>>> approaches
>>> like mux.js that are intended to remux the stream as needed in the
>>> browser, but I rather stick to MP4/MPEG2-TS.
>>> 
>>> I have not played with ffmpeg-python yet, but good to know. I started
>>> writing a PHP script that generates a ffmpeg command-line for
>>> transcoding a specific video (in fact multiple, because ffmpeg got
>>> killed when I tried to transcode to all formats at once: my system 
>>> ran
>>> out of it's 64 GB memory...).
>>> 
>>> I still couldn't figure out how generate a single DASH manifest for 
>>> webm
>>> and mp4 files. That should be possible, because dash.js added support
>>> for that in 4.0 and shaka seems to have always supported that.
>>> 
>>> Best regards
>>> Stefan
>>> 
>>> 
>>> Am 11.10.22 um 17:00 schrieb Clay via ffmpeg-user:
>>>> Hi Steve
>>>> 
>>>> Have you looked into CMAF for this solution?  I am also working on 
>>>> some
>>>> complex transcoding and packaging actions for HLS ABR delivery.  I 
>>>> am
>>>> looking into using CMAF to reduce the overall storage footprint 
>>>> (gpu/cpu
>>>> threads still cost a lot more than storage).  Also, I am 
>>>> experimenting
>>>> with ffmpeg-python (https://github.com/kkroening/ffmpeg-python), 
>>>> have
>>>> you (or anyone reading this) played around with it?
>>>> 
>>>> *I apologize to the forum for the accidental prior message 
>>>> (inadvertent
>>>> click :-P)
>>>> 
>>>> Liberty & Regard,
>>>> Clay
>>>> 
>>>> _______________________________________________
>>>> ffmpeg-user mailing list
>>>> ffmpeg-user at ffmpeg.org
>>>> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>>>> 
>>>> To unsubscribe, visit link above, or email
>>>> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
>>> 
>>> _______________________________________________
>>> ffmpeg-user mailing list
>>> ffmpeg-user at ffmpeg.org
>>> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>>> 
>>> To unsubscribe, visit link above, or email
>>> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
>>> 
>> 
> 
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
> 
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".

-- 
Grüße / Kind regards,

Robin van der Linden
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0x257F9C8D.asc
Type: application/pgp-keys
Size: 1753 bytes
Desc: not available
URL: <https://ffmpeg.org/pipermail/ffmpeg-user/attachments/20221012/3972cb8e/attachment.key>