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ffmpeg: do bitrate calculation in 64 bits to prevent overflow (#959)

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jasaw
2019-08-12 12:39:44 +10:00
committed by Mr-Dave
parent 1180151543
commit e8161e2825
1 changed files with 1 additions and 1 deletions
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ffmpeg.c
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@@ -558,7 +558,7 @@ static int ffmpeg_set_quality(struct ffmpeg *ffmpeg){
if ((strcmp(ffmpeg->codec->name, "h264_omx") == 0) || (strcmp(ffmpeg->codec->name, "mpeg4_omx") == 0)) {
// H264 OMX encoder quality can only be controlled via bit_rate
// bit_rate = ffmpeg->width * ffmpeg->height * ffmpeg->fps * quality_factor
ffmpeg->quality = (ffmpeg->width * ffmpeg->height * ffmpeg->fps * ffmpeg->quality) >> 7;
ffmpeg->quality = (int)(((int64_t)ffmpeg->width * ffmpeg->height * ffmpeg->fps * ffmpeg->quality) >> 7);
// Clip bit rate to min
if (ffmpeg->quality < 4000) // magic number
ffmpeg->quality = 4000;