Thanks Luca. The mp4 file doesn't work in avconv, avplayer, and Firefox.
I'm not trying to use vorbis in mp4, just in webm. av_guess_format guesses at
the format from the file extension in output-example.c The codec seems to be
"libvo_aacenc" according the name given to it by libav.
Has anybody tried output-example.c lately? I'm wondering if it has issues with
it. The next thing I'll try is stepping through avconv, but I was hoping that
maybe I could use something simpler.
Thanks.
________________________________
From: Luca Barbato <[email protected]>
To: [email protected]
Sent: Sunday, April 22, 2012 9:51 AM
Subject: Re: [libav-api] Writing webm
On 4/21/12 6:30 PM, Jake Alley wrote:
> I downloaded the latest win32 build and tried to write to a webm file with
> this example:
>
> http://libav.org/doxygen/master/libavformat_2output-example_8c-example.html
>
> It fails when trying to open the audio codec
>
> static void open_audio(AVFormatContext *oc, AVStream *st)
> {
> AVCodecContext *c;
>
> c = st->codec;
>
> /* open it */
> if (avcodec_open2(c, NULL, NULL)< 0) {<<<<<< fails here
> fprintf(stderr, "could not open codec\n");
> exit(1);
> }
>
> The codec seems to be set up OK for libvorbis.
>
> codec = 0x6a693460 {name=0x6a6fd67b "libvorbis" long_name=0x6a6fd685
> "libvorbis Vorbis" type=AVMEDIA_TYPE_AUDIO ...}
>
>
> AVI files work fine. MP4 files output without errors but have bad data. Is
> there a better example than output_example.c? Do I have to do more to setup
> the codecs than is shown in output_example.c?
>
Vorbis might not be supported in MP4, which player are you using to
decode/demux it?
lu
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