[FFmpeg-user] Hardening ffmpeg stream download?

[Toralf Richter]

Hello Bo,
I'm thinking as I read your question if it would actually be better to use
a different transport format.
For streaming over the Internet, I use Haivision's SRT protocol. It is
integrated in ffmpeg since some time. I don't know if it's suitable for
your purposes, it's just an idea.
Best regards
Toralf

Am Do., 9. Juni 2022 um 18:16 Uhr schrieb Bo Berglund <bo.berglund at gmail.com
>:

> I have a question regarding how to "harden" my video stream downloads so
> they do
> not get corrupted if a glitch occurs, like Internet loss or something else.
>
> As it is now my streams download fine if all is working OK but when a
> glitch
> occurs the download stops and the video file on disk becomes unplayable.
>
> It happened again yesterday due to a power outage, but has happened before
> for
> other reasons like fiber connectivity problems etc.
>
> The remaining file is not viewable and depending on the viewer I can get a
> message talking about missing moov something.
>
> So my download script uses this basic ffmpeg command to download the video:
>
> CMD="ffmpeg -hide_banner ${MODE} -i \"${M3U8URL}\" -vf scale=w=-4:h=480
> -c:v
> libx264 -preset fast -crf 26 -c:a aac -t ${CAPTURETIME} ${TARGETFILE}"
>
> Where:
> MODE="-referer \"${VIDEOURL}\""
> M3U8URL is the stream's m3u8 URL
> CAPTURETIME is the time in seconds to download
> TARGETFILE is the output mp4 file
>
> Now I wonder if there is some additional ffmpeg argument that can be added
> to
> make the output contuinuously "complete" such that it can be played as far
> as
> the download was done?
>
> Or if it is impossible given the output file format, is there some other
> format
> that can be used to harden the download?
>
> For example, can the download just write to file after reformatting the
> size but
> in say ts format and another process *simultaneously* read that file and
> convert
> it to mp4 during download?
>
> Then at least if the main download stops the "raw" ts file would remain...
> Of course given that ts ia about 10x larger on disk than mp4 one has to
> manage
> this carefully to not fill up the drive..
>
>
> --
> Bo Berglund
> Developer in Sweden
>
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