[PATCH] Make mpeg4 encoder log a more explicit error message when the timebase is not valid.

[Stefano Sabatini]

---
 libavcodec/mpegvideo_enc.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c
index 459ede7..d807855 100644
--- a/libavcodec/mpegvideo_enc.c
+++ b/libavcodec/mpegvideo_enc.c
@@ -519,7 +519,9 @@ av_cold int MPV_encode_init(AVCodecContext *avctx)
     avcodec_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift, &chroma_v_shift);
 
     if(avctx->codec_id == CODEC_ID_MPEG4 && s->avctx->time_base.den > (1<<16)-1){
-        av_log(avctx, AV_LOG_ERROR, "timebase not supported by mpeg 4 standard\n");
+        av_log(avctx, AV_LOG_ERROR, "timebase %d/%d not supported by MPEG 4 standard, "
+               "the maximum admitted value for the timebase denominator is %d\n",
+               s->avctx->time_base.num, s->avctx->time_base.den, (1<<16)-1);
         return -1;
     }
     s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
-- 
1.7.2.3


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