[FFmpeg-trac] #9126(avformat:new): 404 when playing back DASH

[FFmpeg]

#9126: 404 when playing back DASH
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             Reporter:  hjmallon    |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  dash        |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by stevenliu):

 Replying to [comment:3 hjmallon]:
 >     Is the issue reproducible with current FFmpeg git head, the only
 version supported on this bug tracker?
 >
 > I can reproduce it on HEAD (d3d99a0a / "lavc/lscrdec: use
 ff_reget_buffer()").
 >
 >     Can you provide how to create that mpd or leave the usable mpd url
 here?
 >
 > Hmm, the manifest is made by a live video encoder (one of these https
 ://videon-central.com/) so I don't have a web link. With the manifest like
 above the layout of files is:
 >
 > - http://192.168.1.18:8080/live/
 >   - manifest.mpd
 >   - video/
 >     - v_34_10000/
 >       - 1614186048_init.mp4
 >       - 1614186048_123456.m4s
 >   - audio/
 >     - a_35_SAMPLE_RATE_48000/
 >       - 1614186048_init.mp4
 >       - 1614186048_123456.m4s
 >
 > The 404 is generated when ffprobe looks for
 "http://192.168.1.18:8080/live/v_34_10000/1614186048_init.mp4" (without
 the video/ part).
 >
 > I have been able to fix the issue with a patch as follows (I wouldn't
 say I know enough about DASH to say that the patch is correct):
 >
 > {{{
 > diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
 > index b82805c9ce..5abc914c68 100644
 > --- a/libavformat/dashdec.c
 > +++ b/libavformat/dashdec.c
 > @@ -777,14 +777,14 @@ static int resolve_content_path(AVFormatContext
 *s, const char *url, int *max_ur
 >          size += 2;
 >      }
 >
 > +    memset(tmp_str, 0, strlen(tmp_str));
 >      for (i = 0; i < n_baseurl_nodes; ++i) {
 >          if (i == rootId) {
 >              continue;
 >          }
 >          text = xmlNodeGetContent(baseurl_nodes[i]);
 >          if (text && !av_strstart(text, "/", NULL)) {
 > -            memset(tmp_str, 0, strlen(tmp_str));
 > -            if (!ishttp(text) && isRootHttp) {
 > +            if (!ishttp(tmp_str) && !ishttp(text) && isRootHttp) {
 >                  av_strlcpy(tmp_str, root_url, size + 1);
 >              }
 >              start = (text[0] == token);
 > }}}

 Can you send this patch to maillist?

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Ticket URL: <https://trac.ffmpeg.org/ticket/9126#comment:4>
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