[Ffmpeg-devel] Re: encoding twice from an app yields lots of "ac-tex damaged at 0 0"

[Karl H. Beckers]

Hi all,

any help on this would be greatly appreciated.
I've tried bumping to recent SVN. Also, I've tried making ffmpeg encode
execute the main look twice (which works without problems). I've also
dumped every global variable I'm using for encoding and can see that every
pointer is different execpt for output format and codec, which shoudl be
references to objects in libavcodec/format and can prolly be expected to
point to the same memory address.
I'm running out of ideas quickly.

You can take a look at the good and broken videos here:
http://www.jarre-de-the.net/computing/test-broken.avi
http://www.jarre-de-the.net/computing/test-works.avi

TIA,

Karl.


On Mon, June 26, 2006 4:03 pm, Karl H. Beckers said:
> Hi all,
>
> I may be doing smth. completely wrong here, but am unable to find what ...
> and perhaps one of you guys has come across this:
>
> I have this app which encodes images gotten elsewhere to a video using
> libavcodec/-format.
> If I do this once everything works like a charm.
> If I start the encoding again after stopping the first one and without
> restarting the whole app, the resulting video is broken. It has MANY
> artefacts most of the time more artefacts than actual video.
> An MSMPEG4v2 video gives lots of these messages:
> "ac-tex damaged at 0 0"
> A FLV1 video these:
> "run overflow at 0x0 i:1"
>
>
> My first idea was "I must be forgetting to clean up smth. between the
> encoding sessions", however I'm unable to find what. when stopping session
> 1 I do:
>
>     if (out_st) {
>         avcodec_close(out_st->codec);
>         out_st = NULL;
>     }
>
>     if (output_file) {
>         /*
>          * write trailer
>          */
>         av_write_trailer(output_file);
>         /*
>          * free stream(s) ... probably always only one
>          */
>         for (j = 0; j < output_file->nb_streams; j++)
>             av_free(output_file->streams[j]);
>
>         /*
>          * close file if multi-frame capture ... otherwise closed already
>          */
>         if (job->target >= CAP_MF)
>             url_fclose(&output_file->pb);
>         /*
>          * free format context
>          */
>         av_free(output_file->priv_data);
>         av_free(output_file);
>         output_file = NULL;
>     }
>
>     if (outpic_buf) { // this is the data of the output frame
>         av_free(outpic_buf);
>         outpic_buf = NULL;
>     }
>     free(outbuf); // this is the memory for the encoded frame
>     outbuf = NULL;
>     av_free(p_inpic);
>     p_inpic = NULL; // the input frame
>     av_free(outpic_buf); the actual image data of the output frame
>     av_free(p_outpic);
>     p_outpic = NULL; // the output frame
>
>     if (input_pixfmt == PIX_FMT_PAL8 && scratchbuf8bit) {
>         free(scratchbuf8bit);
>         scratchbuf8bit = NULL;
>     }
>
>     codec = NULL;
>
>     av_free_static();
>
>
> Any ideas, hints? Am I forgetting anything?
>
> TIA,
>
> Karl.
>