我正在尝试使用 ffmpeg(v3.4) 从视频中提取缩略图以获取视频缩略图，此代码适用于大多数视频文件。
但在 sws_getContext 函数的某些视频上崩溃 请帮助。提前致谢。任何帮助将不胜感激。
const int TARGET_IMAGE_FORMAT = AV_PIX_FMT_RGBA;
const int TARGET_IMAGE_CODEC = AV_CODEC_ID_PNG;
int stream_component_open(State *s, int stream_index)
{
AVFormatContext *pFormatCtx = s->pFormatCtx;
AVCodecContext *codecCtx;
AVCodec *codec;
if (stream_index < 0 || stream_index >= pFormatCtx->nb_streams) {
return FAILURE;
}
codecCtx = pFormatCtx->streams[stream_index]->codec;
codec = avcodec_find_decoder(codecCtx->codec_id);
if (codec == NULL) {
return FAILURE;
}
if (!codec || (avcodec_open2(codecCtx, codec, NULL) < 0)) {
return FAILURE;
}
switch(codecCtx->codec_type) {
case AVMEDIA_TYPE_VIDEO:
s->video_stream = stream_index;
s->video_st = pFormatCtx->streams[stream_index];
AVCodec *targetCodec = avcodec_find_encoder(TARGET_IMAGE_CODEC);
if (!targetCodec) {
return FAILURE;
}
s->codecCtx = avcodec_alloc_context3(targetCodec);
if (!s->codecCtx) {
return FAILURE;
}
s->codecCtx->bit_rate = s->video_st->codec->bit_rate;
s->codecCtx->width = s->video_st->codec->width;
s->codecCtx->height = s->video_st->codec->height;
s->codecCtx->pix_fmt = TARGET_IMAGE_FORMAT;
s->codecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
s->codecCtx->time_base.num = s->video_st->codec->time_base.num;
s->codecCtx->time_base.den = s->video_st->codec->time_base.den;
if (!targetCodec || avcodec_open2(s->codecCtx, targetCodec, NULL) < 0) {
return FAILURE;
}
__android_log_print(ANDROID_LOG_ERROR, LOG_TAG, "CRASH START");
s->sws_ctx = sws_getContext(s->video_st->codec->width,
s->video_st->codec->height,
s->video_st->codec->pix_fmt,
s->video_st->codec->width,
s->video_st->codec->height,
TARGET_IMAGE_FORMAT,
SWS_BILINEAR,
NULL,
NULL,
NULL);
__android_log_print(ANDROID_LOG_ERROR, LOG_TAG, "THIS WONT COME");
break;
default:
break;
}
return SUCCESS;
}
最佳答案
添加
if(s->video_st->codec->pix_fmt==-1)
s->video_st->codec->pix_fmt=0;
在 sws_getContext 调用 ffmpeg_3.4 之前
关于android - FFMPEG 视频缩略图，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51322811/