[Cin] New thread on bdwrite + mpeg2 HDV video

[Andrew Randrianasulu]

пн, 7 нояб. 2022 г., 19:40 Andrew Randrianasulu <randrianasulu at gmail.com>:

>
>
> пн, 7 нояб. 2022 г., 19:10 Andrew Randrianasulu <randrianasulu at gmail.com>:
>
>> Because old thread  now a bit too big for mobile gmail  client.
>>
>> Yes, I'll try to see if it fails same way on my end.
>>
>> code seems to check first 100 frames
>>
>>
>> 2528 static int field_probe(AVFormatContext *fmt_ctx, AVStream *st)
>> 2529 {
>> 2530   AVDictionary *copts = 0;
>> 2531   //av_dict_copy(&copts, opts, 0);
>> 2532   AVCodecID codec_id = st->codecpar->codec_id;
>> 2533 #if LIBAVCODEC_VERSION_INT <= AV_VERSION_INT(58,134,100)
>> 2534   AVCodec *decoder = avcodec_find_decoder(codec_id);
>> 2535 #endif
>> 2536 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(59,16,100)
>> 2537   const AVCodec *decoder = avcodec_find_decoder(codec_id);
>> 2538 #endif
>> 2539   AVCodecContext *ctx = avcodec_alloc_context3(decoder);
>> 2540   if( !ctx ) {
>> 2541     fprintf(stderr,"codec alloc failed\n");
>> 2542     return -1;
>> 2543   }
>> 2544   avcodec_parameters_to_context(ctx, st->codecpar);
>> 2545   if( avcodec_open2(ctx, decoder, &copts) < 0 ) {
>> 2546     fprintf(stderr,"codec open failed\n");
>> 2547     return -1;
>> 2548   }
>> 2549   av_dict_free(&copts);
>> 2550
>> 2551   AVFrame *ipic = av_frame_alloc();
>> 2552   AVPacket ipkt;
>> 2553   av_init_packet(&ipkt);
>> 2554   int ilaced = -1;
>> 2555   for( int retrys=100; --retrys>=0 && ilaced<0; ) {
>> 2556     av_packet_unref(&ipkt);
>> 2557     int ret = av_read_frame(fmt_ctx, &ipkt);
>> 2558     if( ret == AVERROR_EOF ) break;
>> 2559     if( ret != 0 ) continue;
>> 2560     if( ipkt.stream_index != st->index ) continue;
>> 2561     if( !ipkt.data || !ipkt.size ) continue;
>> 2562     ret = avcodec_send_packet(ctx, &ipkt);
>> 2563     if( ret < 0 ) {
>> 2564       fprintf(stderr, "avcodec_send_packet failed\n");
>> 2565       break;
>> 2566     }
>> 2567     ret = avcodec_receive_frame(ctx, ipic);
>> 2568     if( ret >= 0 ) {
>> 2569       ilaced = ipic->interlaced_frame ? 1 : 0;
>> 2570       break;
>> 2571     }
>> 2572     if( ret != AVERROR(EAGAIN) )
>> 2573       fprintf(stderr, "avcodec_receive_frame failed %d\n", ret);
>> 2574   }
>> 2575   av_packet_unref(&ipkt);
>> 2576   av_frame_free(&ipic);
>> 2577   avcodec_free_context(&ctx);
>> 2578   return ilaced;
>>
>> may be we can add flags to force interlaced vs progressive to bdwrite ...
>> and/or debug why it fails.
>>
>>
> sorry, not m2t or m2ts files were found on my main harddrive, so blind
> shot!
>
> Terje, can you recompile bdwrite with attached patch and see if it
> improves situation?
>


err, I think second patch also needed, because ilace in bdwrite is just
1/0/-1 not more detailed.

>
>
>
>>
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