[FFmpeg-devel] [PATCH v2] Option to prevent probing for HTTP seekability

Duncan Salerno duncan.salerno at gmail.com
Wed Sep 26 22:09:34 CEST 2012

On Wed, Sep 26, 2012 at 8:25 PM, Reimar Döffinger
<Reimar.Doeffinger at gmx.de> wrote:
> On Wed, Sep 26, 2012 at 07:56:19PM +0100, Duncan Salerno wrote:
>> Some HLS servers return 403 when the Range header is present. Add an option to HTTP to control sending the range header (default on). HLS sets this option to disabled.
>> Updated with feedback from Clément Bœsch. I'd prefer not to overload the meaning of is_streamed as I think its less clear whats going on.
> IMHO your approach has two disadvantages
> 1) It only works with HTTP
> 2) It doesn't work to do the opposite thing (forcing seeking enabled
> without probing).
> If API is/was not an issue, my suggestion would be to make
> the default of AVIOContext.seekablea new AVIO_SEEKABLE_PROBE by not
> setting probe you could force it to a specific value.
> I suspect this would be possible with keeping API compatibility by
> setting it like that in the avio_alloc_context function.
> I guess there's still going to be a few more open questions like how
> to get it on into the URLContext after that though.

What other protocols does this problem apply to? Should the code be
adapted if/when it turns out to be a problem for others too? IHMO this
is just a caller working round some quirks in HTTP.

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