The error handler for POLLERRs assumes that the timeout is only zero when v4l2_dequeue_v4l2buf is called by v4l2_getfree_v4l2buf. This assumption is incorrect, as ff_v4l2_context_dequeue_frame also calls this function with a timeout of zero. Do not check for unavailable buffers if the buffers are uninitialized.
See https://trac.ffmpeg.org/ticket/9957 for the original bug report. Signed-off-by: Richard Acayan <mailingrad...@gmail.com> --- libavcodec/v4l2_context.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/v4l2_context.c b/libavcodec/v4l2_context.c index a40be94690..69ddf80723 100644 --- a/libavcodec/v4l2_context.c +++ b/libavcodec/v4l2_context.c @@ -327,7 +327,7 @@ start: if (pfd.revents & POLLERR) { /* if we are trying to get free buffers but none have been queued yet no need to raise a warning */ - if (timeout == 0) { + if (timeout == 0 && ctx->buffers) { for (i = 0; i < ctx->num_buffers; i++) { if (ctx->buffers[i].status != V4L2BUF_AVAILABLE) av_log(logger(ctx), AV_LOG_WARNING, "%s POLLERR\n", ctx->name); -- 2.41.0 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
