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there are divx5? encoded files without a userdata section but with b-frames :(
Originally committed as revision 446 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -2747,7 +2747,6 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
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{
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int time_incr, startcode, state, v;
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int time_increment;
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int vol_control=-1;
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redo:
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/* search next start code */
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@ -2791,7 +2790,7 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
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skip_bits(&s->gb, 8); // par_height
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}
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if ((vol_control=get_bits1(&s->gb))) { /* vol control parameter */
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if ((s->vol_control_parameters=get_bits1(&s->gb))) { /* vol control parameter */
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int chroma_format= get_bits(&s->gb, 2);
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if(chroma_format!=1){
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printf("illegal chroma format\n");
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@ -3000,6 +2999,10 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
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}
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s->pict_type = get_bits(&s->gb, 2) + I_TYPE; /* pict type: I = 0 , P = 1 */
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if(s->pict_type==B_TYPE && s->low_delay && s->vol_control_parameters==0){
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printf("low_delay flag set, but shouldnt, clearing it\n");
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s->low_delay=0;
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}
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// printf("pic: %d, qpel:%d\n", s->pict_type, s->quarter_sample);
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time_incr=0;
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while (get_bits1(&s->gb) != 0)
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@ -3109,8 +3112,7 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
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}
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/* detect buggy encoders which dont set the low_delay flag (divx4/xvid/opendivx)*/
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// note we cannot detect divx5 without b-frames easyly (allthough its buggy too)
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if(s->vo_type==0 && vol_control==0 && s->divx_version==0){
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if(s->picture_number==0)
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if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==0 && s->picture_number==0){
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printf("looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
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s->low_delay=1;
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}
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@ -159,7 +159,9 @@ int MPV_common_init(MpegEncContext *s)
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s->next_picture_base[i] = pict;
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s->next_picture[i] = pict + pict_start;
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if (s->has_b_frames) {
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if (s->has_b_frames || s->codec_id==CODEC_ID_MPEG4) {
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/* Note the MPEG4 stuff is here cuz of buggy encoders which dont set the low_delay flag but
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do low-delay encoding, so we cant allways distinguish b-frame containing streams from low_delay streams */
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pict = av_mallocz(c_size);
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if (pict == NULL)
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goto fail;
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@ -313,6 +313,7 @@ typedef struct MpegEncContext {
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int resync_x_pos;
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int low_delay; /* no reordering needed / has no b-frames */
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int vo_type;
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int vol_control_parameters; /* does the stream contain the low_delay flag, used to workaround buggy encoders */
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/* divx specific, used to workaround (many) bugs in divx5 */
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int divx_version;
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