Re: Missing data fragments when custom headers set

On 11/24/2019 6:42 AM, Firefox OS via curl-library wrote:
> Dnia 2019-11-24, o godz. 10:21:07
> tangram67 via curl-library<curl-library_at_cool.haxx.se> napisał(a):
>
>> Hi to all.
>>
>> I'm using libcurl as a receiver for MP3 radio streams.
>> When using custom headers in conjunction with header and body data
>> callbacks, some data is missing in the data callbacks. This is also
>> reproducable when using the following command line:
>>
>> curl --header "Icy-MetaData: 1" -sD - -o ./ndr1.mp3
>> http://ndr-edge-2061.dus-lg.cdn.addradio.net/ndr/ndr1niedersachsen/hannover/mp3/128/stream.mp3
>>
>> If you play the resulting MP3 file with some kind of media player you
>> can hear dropdowns caused by missing data. If you remove the custom
>> header, then the stream is OK. Also this behaviour is independant of the
>> header value, so any header string will cause the problem.
>>
> Hi Dirk,
>
> What makes you think the dropdowns are caused by missing data?
>
> You requested the server to multiplex metadata with the MP3 stream.
> You can't send such a stream directly to MP3 decoder. Instead,
> your client needs to extract "icy-metaint:" response header and demux
> the stream appropriately (extract the metadata instead of sending
> them to MP3 decoder). Otherwise you're periodically feeding the decoder
> with garbage.
>
> Please cross-check your results with a client which doesn't use libcurl, e.g.
> wget -S --header "Icy-MetaData: 1" -O ndr2.mp3http://ndr-edge-2061.dus-lg.cdn.addradio.net/ndr/ndr1niedersachsen/hannover/mp3/128/stream.mp3

For demux explanation check out https://stackoverflow.com/a/44090879 so
it is possible, but I'd only do it if you have to.

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Received on 2019-11-24