On Thu, Jan 19, 2017 at 10:33:25AM -0800, Sasi Inguva wrote: > According to spec ( ISO-IEC-15444-12 ) specifying edit list duration 0, > makes sense for MP4F files > "A nonâempty edit may insert a portion of the media timeline that is not > present in the initial movie, and > is present only in subsequent movie fragments. Particularly in an empty > initial movie of a fragmented > movie file (when there are no media samples yet present), the > segment_duration of this edit may be > zero, whereupon the edit provides the offset from media composition time to > movie presentation time, > for the movie and subsequent movie fragments. It is recommended that such > an edit be used to > establish a presentation time of 0 for the first presented sample, when > composition offsets are used" > > I was contacted with such a file previously and I tried playing that in > Quicktime in mac to see its behavior. When I played the video with > Quicktime 10.4 it showed the poster frame. When I played it with Quicktime > 7 , it showed black screen. Even in Quicktime 10.4 when you export the > video to reencode it, the output file has only audio. > > However your hack seems to be specialized enough, so as not to hurt other > edit list cases. You just need to check that the file is not Fragmented MP4 > , and need to check for st->nb_index_entries == 1 instead of > chunk_count==1.
I'm looking for a way to check the fragmented case. Would introducing MOVContext.found_moof (like for moov) and set it in mov_read_moof OK ? The other variables from MOVContext.fragment do not look like good candidates to perform the fragmented check against. [...] _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
