One can use slices without slice-threading. The results for mpegvideo-encoders are abysmal: AMV, SpeedHQ, H.263, RV10, RV20, MSMPEG4v2, MSMPEG4v3 and WMV1 produce broken files. WMV2 meanwhile expects the MpegEncContext given to ff_wmv2_encode_mb() to be at the beginning of a Wmv2Context (a structure that this encoder shares with the WMV2 decoder), yet this is only true for the main context and not for the slice contexts, leading to segfaults. SpeedHQ additionally triggers an av_assert2, because it is not byte-aligned at a position where it ought to be byte-aligned.
Given that no codec not supporting slice threading works this commit disallows using slices unless the encoder supports slice threading. Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com> --- libavcodec/mpegvideo_enc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c index 33f2937217..6df2a46eaa 100644 --- a/libavcodec/mpegvideo_enc.c +++ b/libavcodec/mpegvideo_enc.c @@ -599,7 +599,7 @@ av_cold int ff_mpv_encode_init(AVCodecContext *avctx) } if (avctx->slices > 1 && - (avctx->codec_id == AV_CODEC_ID_FLV1 || avctx->codec_id == AV_CODEC_ID_H261)) { + !(avctx->codec->capabilities & AV_CODEC_CAP_SLICE_THREADS)) { av_log(avctx, AV_LOG_ERROR, "Multiple slices are not supported by this codec\n"); return AVERROR(EINVAL); } -- 2.32.0 _______________________________________________ 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".