/* faststart: moov at the beginning of the file, if supported */
if (mov->flags & FF_MOV_FLAG_FASTSTART) {
if ((mov->flags & FF_MOV_FLAG_FRAGMENT) ||
- (s->flags & AVFMT_FLAG_CUSTOM_IO))
+ (s->flags & AVFMT_FLAG_CUSTOM_IO)) {
+ av_log(s, AV_LOG_WARNING, "The faststart flag is incompatible "
+ "with fragmentation and custom IO, disabling faststart\n");
mov->flags &= ~FF_MOV_FLAG_FASTSTART;
+ }
}
/* Non-seekable output is ok if using fragmentation. If ism_lookahead