[FFmpeg-user] Add soft subtitles to YouTube Stream Now?

Verachten Bruno gounthar at gmail.com
Wed Nov 20 22:16:21 EET 2019


That's a very interesting subject (to me at least).
I would like to embed automatic (or human generated, depending on the
budget) subtitles to help hearing-impaired people grab most of the
talk in our conference.
I am producing H.264 and sending it (for the time being) to YouTube,
so your request is not far from my needs.
I will follow this subject with great attention.
Thanks.

On Wed, Nov 20, 2019 at 5:20 PM Michael Shaffer <mikeshaffer at gmail.com> wrote:
>
> I noticed your Youtube streams only last a day or so. I have a Python
> script I made that keeps the ffmpeg process sending to Youtube. I have 5 IP
> cameras going to youtube and they have been going about 9 months without
> the stream ending. Anyways, if you want I could show you how the script
> works. You would just have to change the stream keys and the bitrate that
> each camera uses, so it knows when to restart the stream.
>
> Michael
>
> On Wed, Nov 20, 2019 at 12:17 AM Steven Kan <steven at kan.org> wrote:
>
> > First time poster, so please be kind if I ask anything stupid!
> >
> > I have a live BeeCam feed on YouTube:
> >
> > https://www.youtube.com/channel/UCE0jx2Z6qbc5Co8x8Kyisag/live <
> > https://www.youtube.com/channel/UCE0jx2Z6qbc5Co8x8Kyisag/live>
> >
> > using YouTube’s “Stream Now” feature, which is distinct from a streaming
> > “event” because I don’t have to schedule it. Whenever I’m pushing video to
> > YouTube, the channel goes live.
> >
> > The stream is supplied by a Raspberry Pi running as an ffmpeg “relay
> > server,” e.g. it’s not doing any transcoding; it’s just repacking an RTSP
> > stream from an off-the-shelf camera:
> >
> > ./ffmpeg -re -thread_queue_size 512 -rtsp_transport tcp -i "rtsp://
> > anonymous:password at 192.168.1.11:554" -f concat -safe 0 -i playlist.txt
> > -vcodec copy -acodec copy -t 01:47:02 -f flv "rtmp://
> > a.rtmp.youtube.com/live2/my-youtube-streaming-key”
> >
> > The -t and playlist.txt are because my camera lacks and audio feed, and YT
> > requires an audio stream, so I have a collection of royalty-free mp3s in
> > the playlist, and I’m wrapping this command in a loop.
> >
> > When I run this on my RPi 2, CPU utilization for ffmpeg is <<<<10%, which
> > is what I want, because I will have up to 3 instances of ffmpeg pushing 3
> > camera streams to 3 YT channels during honey bee swarm season in Spring.
> >
> > What I want to do is add some captions to the video as soft subtitles,
> > e.g. my location, the present temperature, and the weather forecast. I
> > don’t have enough CPU on the Pi to burn these into the video stream.
> >
> > Is this possible in ffmpeg and with YouTube’s “stream now” feature?
> >
> > I can get ffmpeg to put a soft subtitle into a local .mkv file:
> >
> > ./ffmpeg -i video.mp4" -i SubtitleTest.srt -acodec copy -scodec copy
> > out.mkv
> >
> > but I changing the output to .m4v, mp4, or .flv results in errors such as:
> >
> > Subtitle codec 'ass' for stream 2 is not compatible with FLV
> >
> > and pushing mkv to YouTube via:
> >
> > ./ffmpeg -i video.mp4" -acodec copy -f mkv "rtmp://
> > a.rtmp.youtube.com/live2/my-youtube-streaming-key”
> >
> > returns:
> >
> > Requested output format 'mkv' is not a suitable output format
> > rtmp://a.rtmp.youtube.com/live2/my-youtube-streaming-key <rtmp://
> > a.rtmp.youtube.com/live2/my-youtube-streaming-key>
> >
> > Am I doing this fundamentally wrong? Or is this just not possible? If it’s
> > possible I will continue reading documentation until I get it working!!!
> >
> > Thanks!
> >
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-- 
Bruno Verachten


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