The first byte contains compression level together with keyframe status. When a frame is not interpreted correctly, its data is summed to the reference, and would degrade over time, producing an incorrect result.
Signed-off-by: Vittorio Giovara <[email protected]> --- libavcodec/screenpresso.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/libavcodec/screenpresso.c b/libavcodec/screenpresso.c index 9635b60..8519a2d 100644 --- a/libavcodec/screenpresso.c +++ b/libavcodec/screenpresso.c @@ -115,11 +115,9 @@ static int screenpresso_decode_frame(AVCodecContext *avctx, void *data, return AVERROR_INVALIDDATA; } - /* Basic sanity check, but not really harmful */ - if (avpkt->data[0] != 0x72 && avpkt->data[0] != 0x73) - av_log(avctx, AV_LOG_WARNING, "Unknown header 0x%02X\n", avpkt->data[0]); - - keyframe = (avpkt->data[0] == 0x73); + /* Compression level and keyframe information */ + av_log(avctx, AV_LOG_DEBUG, "Compression level %d\n", avpkt->data[0] >> 4); + keyframe = (avpkt->data[0] & 0x03 == 3); /* Pixel size */ switch (avpkt->data[1]) { -- 2.7.3 _______________________________________________ libav-devel mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-devel
