兼容ffmpeg6.0 (#2648 #2689)

src/Codec/Transcode.cpp

@@ -436,6 +436,7 @@ FFmpegDecoder::FFmpegDecoder(const Track::Ptr &track, int thread_num, const std:
         av_dict_set(&dict, "zerolatency", "1", 0);
         av_dict_set(&dict, "strict", "-2", 0);
 
+#ifdef AV_CODEC_CAP_TRUNCATED
         if (codec->capabilities & AV_CODEC_CAP_TRUNCATED) {
             /* we do not send complete frames */
             _context->flags |= AV_CODEC_FLAG_TRUNCATED;
@@ -443,6 +444,7 @@ FFmpegDecoder::FFmpegDecoder(const Track::Ptr &track, int thread_num, const std:
             // 此时业务层应该需要合帧
             _do_merger = true;
         }
+#endif
 
         int ret = avcodec_open2(_context.get(), codec, &dict);
         av_dict_free(&dict);