[Libav-user] [NEWSLETTER] help

[Richard Hussong]

The interrupt_callback is not an error callback; it is called periodically
during length operations. You need to return 0 from your decode_interrupt()
if you want to continue processing. Otherwise, you get the "immediate exit
requested" error.

- Richard

On Fri, Jul 31, 2020 at 10:42 AM Carlos Esponda <esponda.carlos9 at gmail.com>
wrote:

> I tried it, confirm it was valid with VLC however “immediate exit
> requested” is still the error I get.
>
> On Fri, Jul 31, 2020 at 9:30 AM KeithG <ys3al35l at gmail.com> wrote:
>
>> Try this URL:
>>
>> rtsp://wowza.radia.cz:1935/CRo/DDur.stream
>>
>> Keith
>>
>> On Fri, Jul 31, 2020 at 9:11 AM Carlos Esponda <esponda.carlos9 at gmail.com>
>> wrote:
>>
>>> I took out my IP address just for anonymity. (I’m new to networking and
>>> not sure if it mattered) however I confirm my url works by testing it with
>>> VLC.  The error I always get is “immediate exit requested”
>>>
>>> On Fri, Jul 31, 2020 at 8:34 AM Mihai Chindea <mihai.chindea at uti.eu.com>
>>> wrote:
>>>
>>>> i think your problem is the url you are passing to
>>>> "avformat_open_input", RTSP runs on top of TCP, i doubt it works without a
>>>> valid hostname/ip address.
>>>>
>>>>
>>>> Mihai,
>>>>
>>>>
>>>> ------------------------------
>>>> *From:* Libav-user <libav-user-bounces at ffmpeg.org> on behalf of Carlos
>>>> Esponda <esponda.carlos9 at gmail.com>
>>>> *Sent:* Friday, July 31, 2020 2:25 AM
>>>> *To:* libav-user at ffmpeg.org
>>>> *Subject:* [NEWSLETTER] [Libav-user] help
>>>>
>>>> I am currently trying to read an RTSP stream with FFMPEG and can't get
>>>> past avformat_open_input.
>>>>
>>>> Any help would be appreciated!
>>>>
>>>> thank you.
>>>>
>>>>   #include <iostream>
>>>>
>>>> extern "C"
>>>> {
>>>> #include <libavformat/avformat.h>
>>>> #include <libavcodec/avcodec.h>
>>>> #include <libavcodec/codec.h>
>>>> #include "libswscale/swscale.h"
>>>> #include "libavutil/avutil.h"
>>>> #include "libavutil/frame.h"
>>>> #include "libavcodec/codec_id.h"
>>>> #include "libavutil/pixfmt.h"
>>>> #include "libavutil/imgutils.h"
>>>> }
>>>>
>>>>
>>>> int decode_interrupt(void*);
>>>>
>>>> int main()
>>>> {
>>>>     AVFrame* frame = NULL;
>>>>     AVFormatContext* formatc = NULL;
>>>>     const AVIOInterruptCB int_cb = { decode_interrupt, NULL };
>>>>     AVCodec* codec = NULL;
>>>>     AVCodecContext* codecc = NULL;
>>>>     char* error = new char[255];
>>>>
>>>>     if (!(frame = av_frame_alloc())) {
>>>>         std::cout << " failed to alloc frame";
>>>>         return -1;
>>>>     }
>>>>     formatc = avformat_alloc_context();
>>>>     formatc->interrupt_callback = int_cb;
>>>>
>>>>     codec = avcodec_find_decoder(AV_CODEC_ID_H264);
>>>>     codecc = avcodec_alloc_context3(codec);
>>>>     int result = avcodec_open2(codecc, codec, NULL);
>>>>     if (result != 0) {
>>>>         std::cout << "failed to open codec";
>>>>     }
>>>>
>>>>     result = avformat_open_input(&formatc, "rtsp://:8554/testStream",
>>>> NULL, NULL);
>>>>     if (result != 0) {
>>>>         av_strerror(result, error, 255);
>>>>         std::cout << "couldnt open input " << error<< std::endl;
>>>>         avformat_close_input(&formatc);
>>>>         return -1;
>>>>     }
>>>>
>>>>     result = avformat_find_stream_info(formatc, NULL);
>>>>     if (result != 0) {
>>>>         std::cout << "could not find stream information\n";
>>>>         return -1;
>>>>     }
>>>>
>>>>     return 0;
>>>> }
>>>>
>>>> int decode_interrupt(void * ctx) {
>>>>     std::cout << "interupted\n";
>>>>     return -1;
>>>> }
>>>>
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>>>
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>>
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>
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