2010/6/7 Luca Abeni <[email protected]>:
> Hi,
>
> On 07/06/10 17:01, Leandro Santiago wrote:
> [...]
>>
>> When I open the video
>>
>> av_open_input_file(&pFormatCtx,"/dev/video0",iFmt,0,NULL);
>>
>> this message is printed on screen:
>>
>> [video4linux2 @ 0x19c6010]Estimating duration from bitrate, this may
>> be inaccurate
>>
>> And the dump data show stream with negative bitrate (-2147483). This
>> is the dump_format() output:
>>
>> Input #0, video4linux2, from '/dev/video0':
>> Duration: N/A, start: 1275920057.312480, bitrate: -2147483 kb/s
>> Stream #0.0: Video: rawvideo, yuyv422, 320x240, -2147483 kb/s,
>> 1000k tbr, 1000k tbn, 1000k tbc
>
> Uhm.. Not sure about this problem... Do you call av_find_stream_info()?
>
>
>> After get the stream, when I start the frame capture loop with
>> av_read_frame, I see that each packet captured is a frame (I don't
>> know if this is the correct behavior)
>
> Yes, this is correct.
>
>> and after 32 frames the programs exit with this error:
>>
>> [video4linux2 @ 0x19c6010]ioctl(VIDIOC_DQBUF): Invalid argument
>
> This generally means that you are not calling av_free_packet() on the
> AVPackets containing the input frames.
Thanks. It resolved my problem with frames.
>
>> So I need to do where can I find a good and updated tutorial or thread
>> on list for libav beginners. For example, who is the "img_convert"
>> replacement?
>
> Not sure about tutorials, but the img_convert() replacement is swscale (see
> libswscale/swscale-test.c for an example usage).
Ok, I'm now looking these examples. Thx :-)
>
>
> Luca
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