[Libav-user] [FFmpeg-devel] MOV and custom IO

Michael Niedermayer michaelni at gmx.at
Tue Jul 24 22:38:15 CEST 2012

On Sun, Jul 22, 2012 at 02:01:02PM +0100, David Rodrigues wrote:
> Hi everyone.
> I've written some code to change the video container from MOV to MPEG-TS using ffmpeg API successfully. I'm using physical files. 
> Now i have to change my input from file to custom IO. I changed the code for use custom IO with a callback (read_packet_callback) to feed ffmpeg.
> fmtCtx = avformat_alloc_context();
> iformat = av_find_input_format(input_fmt);
> ibuffer = (unsigned char *) av_malloc(BUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE)
> fmtCtx->pb = avio_alloc_context(ibuffer, 
> 				BUF_SIZE, 
> 				0, 
> 				read_context, 
> 				read_packet_callback, 
> 				NULL, 
> 				NULL);
> avformat_open_input(&fmtCtx, "in-memory", iformat, NULL)
> When i run the code the function avformat_open_input blocks, it reads N chunks of data but don't terminate with or without error. This happens with MOV format. I've tried using MPEG-TS format and this code runs successfully.
> There's a special trick for MOV format? Has anyone encountered this problem?

are your mov files streamable ? if not your custom IO needs to support

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Let us carefully observe those good qualities wherein our enemies excel us
and endeavor to excel them, by avoiding what is faulty, and imitating what
is excellent in them. -- Plutarch
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